0-9

7-Zip

Open source file archiver, or an application used to compress files

Open Source

960 Grid System

CSS Grid Layout Framework

Framework

A

AbiWord

Free and open source software word processor written in C++

Open Source

Acceleo

Pragmatic implementation of the Object Management Group (OMG) MOF Model to Text Language (MTL)

accounting.js

Tiny JavaScript library for number, money and currency formatting

JavaScriptLibrary

ACK

Fast, lightweight and retargetable compiler suite and toolchain for C, Pascal, Modula-2, Occam, and BASIC

AdaptCMS

PHP Content Management System, adaptable to any type of content website

PHP

ADempiere

Enterprise Resource Planning or ERP software package written in Java

Java

ALBOW

Widget set for creating a GUI using PyGame

GUI

Alchemy

Open drawing project aimed at exploring how we can sketch

Amarok

Cross-platform free and open source music player

AudioOpen Source

Ampache

Web based audio/video streaming application and file manager

Amsynth

Open source realtime software synthesizer for Linux

LinuxOpen Source

Anaconda Server

Deploy and Manage Python and Other Packages Internally

Python

Android

Operating system based on the Linux kernel and designed primarily for touchscreen mobile devices

Linux

AngularJS

Googles JavaScript MVC Framework for DOM Manipulation

FrameworkJavaScript

Anima.js

Lightweight JavaScript animation library

AnimationJavaScriptLibrary

Animate.css

Bunch of cool, fun, and cross-browser animations for you to use in your projects

Anjuta DevStudio

C++ software development studio

Annotator

Open-source JavaScript library and tool that can be added to any webpage to make it annotatable

JavaScriptLibraryOpen Source

AntTweakBar

C/C++ library to add light and graphical user interface into graphic applications based on OpenGL

GUILibrary

AOKP

Open source replacement distribution based on the Android mobile operating system

Open Source

Apache Ant

Tool for automating software build processes, especially for Java

Apache Bloodhound

Open source web-based project management and bug tracking system written in Python

Open SourcePython

Apache Flex

SDK for the development and deployment of rich Internet applications based on Adobe Flash

Apache Hadoop

Open source software framework for storage and large scale processing of data-sets on clusters of commodity hardware

Apache HTTP Server

Widespread web server application

Apache Lenya

Open source content management for Java and XML

Apache OFBiz

Open source enterprise resource planning (ERP) system written in Java

JavaOpen Source

Apache OpenOffice

Open-source office productivity software suite

Open Source

Apache Roller

Full-featured, multi-user and group-blog server written in Java

Java

Apache Solr

Fast open source enterprise search platform from the Apache Lucene project

Apache Struts 2

Open source web application framework for developing Java EE web applications

FrameworkJavaOpen Source

Apache Subversion

Software versioning and revision control system

Apache Tomcat

Open source software implementation of the Java Servlet and JavaServer Pages

JavaOpen Source

Apache Wicket

Lightweight component-based web application framework for the Java

FrameworkJava

AppFlower

Open source application builder for use in building web-based applications written in PHP

Open SourcePHP

Aptana Studio

Open-source web development IDE written in Java and JavaScript

IDEJavaJavaScriptOpen Source

Arch Linux

Linux-based operating system for i686 and x86-64 computers

G1

Ardour

Powerful digital audio editor and sequencer

Audio

ArgoUML

UML diagramming application written in Java

Java

Armadillo

C++ linear algebra library

Library

Assetic

Asset management framework for PHP

DAMFrameworkPHP

Astropy Project

Community effort to develop a single core package for Astronomy in Python

Python

Async.js

Async JavaScript utilities for node and the browser

JavaScript

aTunes

Free and open source audio player with MPlayer as its playback engine

AudioOpen Source

Audacious

Free and open source audio player with a focus on low resource usage

AudioOpen Source

Audacity

Free open source digital audio editor

AudioOpen Source

audiolib.js

Audio tools library for javascript

Away3D

ActionScript 3D Graphics Engine

3D GraphicsActionScript

awesome

Dynamic window manager for the X Window System developed in C and Lua

CLua

AWStats

Open source Web analytics reporting tool

Open Source

B

Backbone.js

Lightweight MVP Library for JavaScript

JavaScriptLibrary

BackupPC

System for backing up Linux, WinXX and MacOSX PCs and laptops to a server's disk

Balsa

Lightweight email client for GNOME

Banshee

Cross-platform open-source media player

Open Source

Batavi

Open source webshop written in PHP

Open SourcePHP

batman.js

Build rich web apps in CoffeeScript like you do with Ruby on Rails

Ruby

Beamer

LaTeX document class for creating slides for presentations

Beautiful Soup

Python library designed for quick turnaround projects like screen-scraping

LibraryPython

Behave.js

Lightweight library for adding IDE style behaviors to plain text areas

IDELibrary

Bespoke.js

Super minimal modular presentation library for JavaScript

JavaScriptLibrary

BigFish

Open source ecommerce (ERP) platform written in Java

JavaOpen Source

biogo

A bioinformatics library for the Go language

Library

Biopython

Set of freely available tools for biological computation written in Python

Python

BitchX

Free IRC client and has been considered to be the most popular ircII-based IRC client

G1

Blender

It's a miracle, powerful 3D Modeller, Game Engine, Video Editor and much more

3D GraphicsVideo

Blender CAM

Open source solution for artistic CAM and G-Code generation based on Blender

CAMOpen Source

Blender SVG Export

Renders Scene to SVG

Bluefish

Free and open source advanced text editor

Open Source

BlueGriffon

WYSIWYG content editor for the World Wide Web based on Gecko

Blueprint

CSS framework with grid, typography, plugins and print support

Framework

Bokeh

Python interactive visualization library for large datasets that natively uses the latest web technologies

LibraryPython

Bonsai

Lightweight graphics library with SVG renderer to use with JavaScript

JavaScriptLibrary

G1

Boost

C++ Library that adds Data Types, Concurrency, Memory Management and more.

Library

Bootstrap

Front-end framework for RIA and Website development. Supports Sass and Less CSS Preprocessors

Framework

boto

Python interface to Amazon Web Services

Python

Bottle

Lightweight Web Framework for Python

FrameworkPython

Bourbon

Lightweight mixin library for Sass

Library

Bower

Package manager for the web

Brasero

Free disc-burning program for Unix-like systems

Breeze

JavaScript library that helps you manage data in rich client applications

JavaScriptLibrary

Brig

Interaction with many databases for C++

BRL-CAD

Cross-platform open source solid modeling system

Open Source

Bullet

Real-Time Physics Simulation

busted

Unit testing framework for Lua

FrameworkLua

Buzz

Lightweight PHP 5.3 library for issuing HTTP requests

LibraryPHP

bzip2

Free and open-source file compression program that uses the Burrows–Wheeler algorithm

Open Source

C

Cafu Engine

All-purpose 3D graphics engine and game development kit

3D Graphics

Cairo

2D graphics library written in C

CLibrary

CakePHP

Open source web application framework

FrameworkOpen Source

Calligra Flow

Free diagramming software

Calligra Sheets

Free software spreadsheet application

Calligra Stage

Free presentation program

Calligra Suite

Graphic art and office suite by KDE forked from KOffice

canvg

SVG parser and renderer for JavaScript

JavaScript

Cappuccino

JavaScript RIA Development Framework

FrameworkJavaScript

Carbon

A simple API extension for DateTime with PHP 5.3+

PHP

Carrot2

Open source search results clustering engine written in Java

JavaOpen Source

Cascade Framework

Free frontend framework for creating websites and web applications

Framework

CEGUI

Crazy Eddie's GUI System written in C++

GUI

Cesium

JavaScript library for creating 3D globes and 2D maps in a web browser

3D GraphicsJavaScriptLibrary

CGAL

Computational Geometry Algorithms Library written in C++

Library

cgkit

Python Computer Graphics Kit, useful for any domain where you have to deal with 3D data

3D GraphicsPython

Chaplin

Architecture for JavaScript applications using the Backbone.js library

JavaScriptLibrary

Chardin.js

jQuery plugin that creates a simple overlay to display instructions on existent elements

Chart.js

Easy, object oriented client side graphs for designers and developers written in JavaScript

JavaScript

Chartkick.js

Javascript charts with minimal code

JavaScript

cheet.js

Easter eggs (konami code, etc) for your site

chemicalize.org

Free chemical structure miner and web search engine written in PHP

PHP

Cherokee

Open-source cross-platform web server

Open Source

CherryPy

Minimalistic Python Web Framework

FrameworkPython

Chipmunk

Portable 2D physics engine

ChocolateChip-UI

JavaScript framework for making mobile Web apps built on jQuery

FrameworkJavaScript

Chromium

Open source web browser project from which Google Chrome draws its source code

Open Source

Chromium OS

Linux-based operating system designed by Google to work exclusively with web applications

ChucK

strongly timed audio programming language for real-time synthesis

Audio

Cinelerra

Video editor and compositor for Linux

LinuxVideo

Cinelerra-CV

Community Version of the Cinelerra video editor and compositor

Video

CinePaint

Open source computer program for painting and retouching bitmap frames of films

Open SourcePixel Graphics

Cinnamon

GTK+-based desktop environment that started as a fork of the GNOME Shell

CINT

An interpreter for C and C++ code

C

Citadel

Collaboration suite including messaging and groupware

CiviCRM

Internationalized suite of computer software for constituency relationship management written in PHP

PHP

CKEditor

Ready-for-use HTML text editor designed to simplify web content creation

HTML

ClamAV

Open source antivirus engine designed for detecting Trojans, viruses and malware

Open Source

Clang

Compiler front end for the C, C++, Objective-C and Objective-C+

Clementine

Cross-platform free and open source music player and library organizer

AudioLibraryOpen Source

Clonezilla

Free disaster recovery, disk cloning, disk imaging, and deployment computer program

Closure Library

JavaScript library, written specifically to take advantage of the Closure Compiler, based on a modular architecture

JavaScript

Cloud9 IDE

Open source web-based cloud integrated development environment for JavaScript

IDEJavaScriptOpen Source

CLPython

Implementation of the Python programming language written in Common Lisp

Python

G1

CMake

Cross-platform open-source build system

Open Source

CMS Made Simple

Open source content management system for PHP

Open SourcePHP

CMUSphinx

Open source toolkit for speech recognition

cocos2d

2D game development framework for Python

FrameworkPython

Code::Blocks

Free and open source, cross-platform IDE for C, C++ and Fortran

IDE

CodeIgniter

Open source rapid development web application framework written in PHP

FrameworkOpen SourcePHP

CodeLite

Free, open-source, cross-platform IDE for C/C++

IDE

CodeLobster

Multifunctional portable PHP IDE

IDEPHP

codenvy

Online Integrated Development Environment

IDE

CoffeeScript

Write less, do more Language that compiles to JavaScript

JavaScript

COLLADA

Digital Asset and FX Exchange Schema

ColorJizz

PHP library for manipulating and converting colors

LibraryPHP

ColtJS

Framework allowing for easy deployment of JavaScript Applications using Asynchronous Module Definition

FrameworkJavaScript

Compass

Open-source CSS Authoring Framework

FrameworkOpen Source

Compiz

Compositing window manager for the X Window System, using 3D graphics hardware

3D Graphics

concrete5

Open source content management system written in PHP

Open SourcePHP

Contao

Free content management system for medium to large websites written in PHP

PHP

Context Free Art

Generates images from written instructions

controlP5

Widespread GUI for Processing Apps

GUIProcessing

Cookiecutter

A command-line utility that creates projects from project templates, e.g. a Python package project

Python

Cortado

Open-source cross-browser and cross-platform video playback solution written in Java

JavaOpen SourceVideo

Cotonti

Open source web development framework and content manager written in PHP

FrameworkOpen SourcePHP

CouchDB

Document Oriented Database

Database

CppCMS

Open source web application framework for the C++ programming language

FrameworkOpen Source

cron.lua

Time-related functions for Lua, inspired in javascript's setTimeout and setInterval

Crossfilter

JavaScript library for exploring large multivariate datasets

JavaScriptLibrary

Crypto++

Free C++ class library of cryptographic schemes.

Library

CryptoJS

Collection of standard and secure cryptographic algorithms implemented in JavaScript

JavaScript

CrystalSpace

Full-featured Software Development Kit providing real-time 3D graphics

3D Graphics

Csound

Computer programming language for sound written in C

AudioC

CTS

Apply themes to HTML content that uses CSS-style Microformats using JavaScript

HTMLJavaScript

CubicWeb

Semantic web application framework written in Python

FrameworkPython

curl

Command line tool for transferring data with URL syntax

CyanogenMod

Open source operating system for smartphones and tablet computers

Open Source

Cygwin

Unix-like environment and command-line interface for Microsoft Windows

Windows

D

D3

JavaScript library for manipulating documents based on data

JavaScriptLibrary

Dalvik

Process virtual machine in Google's Android operating system

DataMaps

Customizable SVG map visualizations for the web in a single Javscript file using D3.js

datamock.js

Add mock data to your mockups using JavaScript

JavaScript

Dataset

JavaScript client-side data transformation and management library

JavaScriptLibrary

deal.II

Open source library to solve partial differential equation written in C++

LibraryOpen Source

Debian

Operating system composed of free software mostly carrying the GNU General Public License

Delta3D

Full-function 3D game engine appropriate for a wide variety of modeling & simulation applications.

Detector

Combined browser- & feature-detection for PHP

PHP

Dev-C++

Free IDE for programming in C and C++

CIDE

DevKit

JavaScript game development framework

FrameworkJavaScript

Dia

Free and open source general-purpose diagramming software

Open Source

digiKam

Free and open-source image organizer and tag editor written in C++

Open SourcePixel Graphics

digsby

Multiprotocol IM client

DirectFB

Hardware graphics acceleration library written in C

CLibrary

DISPATCH

PHP micro-framework

PHP

django

All you need Web Framework for Python

FrameworkPython

django-tagging

Generic tagging application for Django projects

Docker

Open-source application container engine

Open Source

dojo

OpenSource modular JavaScript Toolkit

JavaScriptOpen Source

Dolibarr

Open source, free software ERP/CRM package for small and medium companies

doT.js

Concise javascript template engine for Node.js and browsers

JavaScript

Dotclear

Open source PHP blog publishing application

Open SourcePHP

dotCMS

Open source web content management system written in Java

JavaOpen Source

dotProject

Web-based, multi-user, multi-language project management application

Doxygen

Tool for generating documentation from annotated sources

DragonFly BSD

Free Unix-like operating system created as a fork of FreeBSD 4.8

Drupal

Just another widespread Web CMS written in PHP

CMSPHP

Drupal Commerce

Open source eCommerce software that augments the content management system Drupal

Open Source

DSpace

Digital asset management system that for Institutional Repository

dwm

Dynamic, minimalist tiling window manager for X Window System

E

Ecasound

Hard-disk recording and audio processing tool written in C++

AudioProcessing

ECL

Common Lisp implementation aimed at producing a small-footprint Lisp system

Eclipse

Free integrated development environment for virtually every language written in Java

IDEJava

EGroupware

Free open source groupware software intended for businesses from small to enterprises written in PHP

Open SourcePHP

Eigen

C++ library of template headers for linear algebra, matrix and vector operation

LibraryVector Graphics

Ekho

Chinese text-to-speech software

Ekiga

VoIP and video conferencing application for GNOME and Windows

VideoWindows

elementary OS

Linux distribution based on Ubuntu

Linux

ELKI

Knowledge discovery in databases software framework

Framework

Emacs

Extensible, customizable text editor

Ember.js

JavaScript Web Application Framework

FrameworkJavaScript

Empathy

Instant messaging and voice over IP client

Energy

Social gaming for Python

Python

Enlightenment

Stacking and compositing window manager for the X Window System

Enyo

Open-source JavaScript framework for cross-platform Applications

FrameworkJavaScriptOpen Source

Epydoc

Automatic API Documentation Generation for Python

Python

Eric

Full featured Python and Ruby editor and IDE

IDEPythonRuby

escapes.js

Render ANSI art using HTML5 / JavaScript

eSpeak

Compact open source software speech synthesizer for Linux, Windows, and other platforms

Open Source

Etherpad

Customizable Open Source online editor providing collaborative editing in real-time

Open Source

Evince

Document viewer for PDF, PostScript, DjVu, TIFF, XPS and DVI

Exaile

Exaile is a music manager and player for GTK+ written in Python

AudioPython

Exponent CMS

Free, open source, open standards modular enterprise software framework and CMS written in PHP

CMSFrameworkPHP

eZ Publish

Open source enterprise PHP content management system

Open SourcePHP

F

F-Spot

Image organizer, designed to provide personal photo management

Pixel Graphics

Fabric.js

Powerful and simple JavaScript HTML5 canvas library

JavaScriptLibrary

Facsimile

High-quality, 3D, discrete-event simulation library written in Java

JavaLibrary

Faker

PHP library that generates fake data for you

LibraryPHP

Fat-Free Framework

Open source web application framework for PHP

FrameworkOpen SourcePHP

Festival

General multi-lingual speech synthesis system

G1

FFmpeg

Cross-platform solution to record, convert and stream audio and video

AudioVideo

figlet.js

A FIG Driver written in JavaScript which aims to fully implement the FIGfont spec

FileZilla

Free FTP Client and Server

Filterus

Flexible PHP 5.3 filter package

PHP

Firefox

Free and open-source web browser

Open Source

Firefox OS

Linux-based open-source operating system for smartphones and tablet computers

Open Source

FireFTP

Free, open source, cross-platform FTP client for Mozilla Firefox in the form of an add-on

Firestarter

Open source Linux Firewall

LinuxOpen Source

FITVIDS.JS

Lightweight, easy-to-use jQuery plugin for fluid width video embeds

Video

FlashDevelop

Open Source ActionScript and Haxe IDE

ActionScriptIDEOpen Source

Flask

Lightweight web application framework written in Python

FrameworkPython

Flat UI Free

Design Framework (html/css3/less/js) based on Bootstrap

Framework

Flex

Lexical Analyzer written in C

C

FLTK

Fast Light Toolkit is a cross-platform C++ GUI toolkit

GUI

FluidSynth

Free open source software synthesizer

Open Source

Flynn

Self-serve management of containerized deployments

FlyVR

Virtual reality engine built on ROS and OpenSceneGraph

FMOD

Audio content creation tool for games

Audio

Fontconfig

Library for configuring and customizing font access

Library

Formance.js

General purpose JavaScript library for formatting and validating form fields

JavaScriptLibrary

Foundation

Free collection of JavaScript tools for creating websites and web applications

JavaScript

FPDF

PHP class which allows to generate PDF files with pure PHP

PHP

fpGUI

Free Pascal GUI Toolkit

GUI

FPSMeter

Simple JavaScript library for themable FPS meter

JavaScriptLibrary

FreeBSD

Free Unix-like operating system descended from AT&T Unix via BSD

Linux

FreeCAD

General purpose 3D CAD modeler

3D GraphicsCAD

freeglut

Free OpenGL Utility Library

Library

FreeNAS

Open source software network-attached storage system based on FreeBSD and the ZFS file system

Open Source

FreeTTS

Open source speech synthesis system written entirely in Java

JavaOpen Source

Fries

Android-like UI using HTML, CSS, and JavaScript

GUIJavaScript

FuelPHP

Open source web application framework written in PHP which implements the HMVC pattern

FrameworkOpen SourcePHP

FuncJS

Open source functions only JavaScript library that aims to speed up web development

JavaScriptLibraryOpen Source

fuzzywuzzy

Fuzzy comparison on strings using Python

Python

G

Gajim

Instant messaging client for the XMPP protoco

Gallium3D

Framework intended to ease the programming of device drivers for 3D graphics chipsets

3D GraphicsFramework

Game Objects

Collection of 2D and 3D maths classes, and algorithms for helping in the creation of games with Python

3D GraphicsPython

Ganglia

Scalable distributed monitoring system for high-performance computing systems such as clusters and Grids

Gantti

Simple PHP Gantt Class

PHP

GanttProject

Java based, project management software that runs under the Windows, Linux and Mac OS X

JavaLinux

GATE

Open source text processor

Open Source

Gaufrette

PHP5 library that provides a filesystem abstraction layer

LibraryPHP

G1

GCC

Compiler system supporting various programming languages

GCJ

Free compiler software for the Java programming language

Java

GDAL

Library for reading and writing raster geospatial data formats

Library

Geany

Lightweight cross-platform GTK+ text editor

Geeklog

Geeklog is an PHP open source application for managing dynamic web content

Open SourcePHP

GEGL

Graph based image processing framework written in C

CFrameworkPixel GraphicsProcessing

Genshi

Template engine for XML-based vocabularies written in Python

Python

Gentoo Linux

Computer operating system based on the Linux kernel and built using the Portage package management system

Linux

GeoExt

OpenLayers with the user interface of Ext JS

GUIJavaScript

GeSHi

Source code syntax highlighting library written in PHP

LibraryPHP

GetSimple CMS

Fee and open source website content management system written in PHP

Open SourcePHP

ggplot2

Data visualization package for the statistical programming language R

GHC

Open source native code compiler for the programming language Haskell

Open Source

GhostBSD

Unix-derivative operating system, desktop-oriented operating system based on FreeBSD for desktop computer

Ghostscript

Suite of software based on an interpreter for Adobe Systems' PostScript and Portable Document Format

gif.js

JavaScript GIF encoding library

JavaScriptLibrary

G1

GIMP

Image manipulation and photo retouching

Pixel Graphics

G1

Git

Distributed revision control and source code management

Glade

A graphical user interface builder for GTK+ written in C

CGUI

GLEW

C and C++ Library for cross-platform OpenGL feature detection

CLibrary

GLEWpy

Advanced OpenGL extensions with Python

Python

GLFW

Multi-platform library for creating windows with OpenGL contexts and managing input and events

LibraryWindows

GLib

Cross-platform software utility library written in C.

Library

GLM

OpenGL Mathematics is a header only C++ mathematics library for graphics software

Library

Gloopy

Python library for creating 3D polyhedra and rendering them using OpenGL

3D GraphicsLibraryPython

Glow

JavaScript DOM Manipulation

JavaScript

gmaps.js

Google Maps in a simple way for JavaScript

JavaScript

Gmsh

Finite element mesh generator written in C++

3D Graphics

GNOME

Desktop environment and graphical user interface for Unix-like platforms

GUI

GNU C Library

GNU Project's implementation of the C standard library

CLibrary

GNU IceCat

Free software rebranding of the Mozilla Firefox web browser

GNU Libtool

Creates portable compiled libraries

GNU Make

Tool which controls the generation of executables and other non-source files of a program

GNU nano

Text editor for Unix-like computing systems or operating environments using a command line interface

GNU OCR

OCR program based on a feature extraction method

GNU plotutils

C/C++ function library for exporting 2-D vector graphics in many file formats

LibraryVector Graphics

GNU Wget

Computer program that retrieves content from web servers

GnuCash

Free software accounting program that implements a double-entry bookkeeping system

Gnulib

A collection of software subroutines which are designed to be usable on many operating systems

Gnumeric

Spreadsheet program that is part of the GNOME Free Software Desktop Project

Go

Open source programming language

Open Source

go-simplejson

Go package to interact with arbitrary JSON

JSON

Gobby

Free collaborative editor written in C++

GOCR

Open source OCR

gogeos

Library for Go that provides operations on spatial data and geometric algorithms

Library

Google Chrome

Freeware web browser developed by Google

Google Maps API

Official Google Maps API for JavaScript

JavaScript

Goutte

Simple PHP Web Scraper

PHP

Goweb

Lightweight RESTful web framework for Go

Framework

GPAC

Open Source multimedia framework

FrameworkOpen Source

Grails

Open source web application framework that uses the Groovy programming language

FrameworkOpen Source

Grammatica

C# and Java parser generator

Java

Gramps

Genealogical research and analysis management programming system, written in Python

Python

Granite Data Services

Client Applications with JavaFX, Flex or Android

graphene

D3.js, Backbone.js based Graphite Dashboard Toolkit

Graphite

Scalable Realtime Graphing for Python

Python

Graphviz

Open source graph visualization software

Open Source

gretl

Open-source statistical package, mainly for econometrics, written in C

COpen Source

Groovy

Object-oriented programming language for the Java platform

Java

groupcache

Caching and cache-filling library for Go

Library

GRUNT

JavaScript Task Runner

JavaScript

GSAP

Animation Library for JavaScript and ActionScript

ActionScriptAnimationJavaScriptLibrary

GSL

GNU Scientific Library is a software library for numerical computations

Library

gThumb

Open-source image viewer and organizer

Open SourcePixel Graphics

GTK+

Multi-platform toolkit for creating graphical user interfaces

gtkmm

Official C++ interface for the popular GUI library GTK+.

GUILibrary

GWT

Googles Web Toolkit for JavaScript RIA Development

JavaScript

gzip

Software application used for file compression and decompression

H

Habari

Open source blog engine written in PHP

Open SourcePHP

Ham

Basically just a fast router with nice syntax, and a cache singleton

Haml

Markup language that’s used to cleanly and simply describe the HTML of any web document

HTML

Hammer.js

JavaScript library for multi-touch gestures

JavaScriptLibrary

HandBrake

Video Converter

Video

Handlebars

Semantic mustache style templates with JavaScript

JavaScript

Happstack

Free application server for websites written in Haskell

HardonCollider

Lua module to simplify collision detection

Lua

Haskell

General-purpose purely functional programming language

HaxeFlixel

Cross-platform game engine

Hazaar MVC

MVC Framework for PHP

FrameworkPHP

Headroom.js

Lightweight JavaScript Classthat allows you to react to the user's scroll

JavaScript

Heatmap.js

Open source JavaScript library that can be used for generating realtime heatmaps

JavaScriptLibraryOpen Source

HeeksCNC

Open source CAD/CAM application

Open Source

Heka

Data collection and processing

Processing

HERE Maps API

JavaScript API that enable developers to build Web applications with interactive HERE Maps

JavaScript

Heyoffline.js

JavaScript Library to warn your users when their network goes down

JavaScriptLibrary

HFS

Free web server specifically designed for publishing and sharing files

Hint.css

Tooltip library in CSS for your lovely websites

Library

Holder.js

Renders image placeholders entirely on the client side using JavaScript

JavaScriptPixel Graphics

HomeBank

Personal accounting software package that runs on Linux, FreeBSD, Microsoft Windows, Mac OS

Horde3

A small open source 3D rendering engine especially for MMOs

3D GraphicsOpen Source

HTCondor

Open-source high-throughput computing software framework for coarse-grained distributed parallelization

FrameworkOpen Source

HTMLPurifier

Standards-compliant HTML filter library written in PHP

HTMLLibraryPHP

Hugin

Cross-platform open source panorama photo stitching and HDR merging program

Open SourcePixel Graphics

HuMo-gen

Cross-platform web application for displaying and editing genealogical data written in PHP

PHP

HybridAuth

Abstract PHP API between your application and various social apis and identities providers

PHP

Hydrogen

Cross-platform drum machine

I

I2P

Computer network layer that allows applications to send messages to each other pseudonymously and securely

i3

Tiling window manager designed for X11, inspired by wmii, and written in C

C

IceWM

Stacking window manager for the X Window System

Idiorm

A lightweight nearly-zero-configuration object-relational mapper and fluent query builder for PHP5

PHP

Ignifuga

Multi platform 2D hardware accelerated engine based on Python and Cython

Python

ImageCache

PHP Image Compression & Caching

PHPPixel Graphics

ImageMagick

Software suite to create, edit, compose, or convert bitmap images

Pixel Graphics

ImageWorkshop

PHP class using GD library to work easily with images as layers

LibraryPHP

Imagine

OOP library for image manipulation built in PHP 5.3

LibraryPHPPixel Graphics

ImpressCMS

Open source CMS for building and maintaining dynamic web sites, written in the PHP

CMSOpen SourcePHP

InfoVis

Interactive Data Visualizations with JavaScript

JavaScript

G1

Inkscape

Vector Graphics Editor

Vector Graphics

inspect.lua

Human-readable representation of Lua tables

Lua

Intro.js

JavaScript Library to generate Introductions for websites and features with a step-by-step guide for your projects

JavaScriptLibrary

inuitcss

Scalable, Sass-based, BEM, OOCSS framework

Framework

iptables

Application that allows a system administrator to configure the tables provided by the Linux kernel firewall

Linux

IPython

Rich architecture for interactive computing with

Irssi

IRC client program for Linux, FreeBSD, Microsoft Windows, and Mac OS X

Islandora

Open source software framework designed to help institutions and organizations and their audiences collaboratively manage

ITK

Open-source framework for the development of image segmentation and image registration programs

FrameworkOpen SourcePixel Graphics

IUP

Multi-platform toolkit for building graphical user interfaces

IVT

Powerful and fast C++ computer vision library

Library

J

JACK

Professional sound server daemon

Audio

Jamroom

Community focused open source software web content management system based on PHP

Open SourcePHP

Jansson

C library for encoding, decoding and manipulating JSON data

CJSONLibrary

Jasmine

Open source testing framework for JavaScript

FrameworkJavaScriptOpen Source

JavaScriptMVC

Open-source JavaScript MVC framework

FrameworkJavaScriptOpen Source

jBrout

Photo manager, written in python/pygtk

Pixel Graphics

Jekyll

Blog-aware, static site generator written in Ruby

Jetty

Pure Java-based HTTP (Web) server and Java Servlet container

Java

JFire

Enterprise Resource Planning and Customer Relationship Management system

jGnash

Free personal finance management application

Jitsi

Free and open source multiplatform VoIP, videoconferencing and instant messaging application

Open Source

G1

JMonkey_Engine

Java 3D Game Engine

3D GraphicsJava

Joomla!

Extendible PHP Web CMS

CMSPHP

jqmPhp

Package of PHP classes that facilitates the creation HTML files for use with jQuery Mobile Framework.

HTMLPHP

JQuantLib

Comprehensive framework for quantitative finance written in Java

FrameworkJava

G1

jQuery

Widespread JavaScript Library

JavaScriptLibrary

jQuery Mobile

Touch-Optimized Web Framework

Framework

jQuery.payment

General purpose jQuery library for building credit card forms, validating inputs and formatting numbers

Library

jQueryUI

GUI for jQuery

GUI

JSBSim

Open source flight dynamics model written in C++

Open Source

JSDoc

Markup language used to annotate JavaScript source code

JavaScript

JSLIBRARYBOILERPLATE

An easy boilerplate for rolling your own JavaScript Library written in CoffeeScript, TypeScript and pure JavaScript

JavaScriptLibrary

G1

JSON

Lightweight data-interchange format with implementations in almost every programming language

Jsonlite

JSON without Quotes for JavaScript

JavaScriptJSON

JSZip

Create, read and edit .zip files with JavaScript

JavaScript

JUCE

Cross-platform C++ application framework,

Julius

Open source large vocabulary CSR engine

JWM

Lightweight stacking window manager for the X Window System

K

K-3D

3D modeling and animation software

3D GraphicsAnimation

Kajona

PHP5 based content management framework

FrameworkPHP

Kaldi

Toolkit for speech recognition written in C++

Kali Linux

Debian-derived Linux distribution designed for digital forensics and penetration testing

Linux

Kartograph

Framework for building interactive map applications without a mapping service for Python and JavaScript

FrameworkJavaScriptPython

KDE SC

Desktop environment and an associated range of KDE Applications produced by KDE

KDevelop

Open source IDE for Linux

IDELinuxOpen Source

Kerkythea

Standalone rendering system that supports raytracing and Metropolis light transport

Kid3

Open-source cross-platform audio tag editor for many audio file formats

AudioOpen Source

KineticJS

HTML5 Canvas JavaScript framework for animations

FrameworkJavaScript

KineticJS

HTML5 Canvas JavaScript framework

FrameworkJavaScript

Kivy

Open source Python library for rapid development of applications

LibraryOpen SourcePython

KMyMoney

Personal finance manager for KDE

KNACSS

Minimalist, responsive and extensible style sheet to kick-start your HTML / CSS projects

HTML

KNIME

Open source data analytics, reporting and integration platform

Open Source

knockout.js

JavaScript UI framework

FrameworkGUIJavaScript

Knoppix

Operating system based on Debian designed to be run directly from a CD / DVD or a USB flash drive

Koala

Koala is a GUI application for Less, Sass, Compass and CoffeeScript compilation

GUI

Komodo Edit

Free text editor for dynamic programming languages

Konqueror

Filemanager, FTP Client, Webbrowser and Viewer

Kontact

Personal information manager and groupware software suite

Konversation

Internet Relay Chat client

KPhone

SIP User Agent for Linux

Linux

Krusader

Advanced twin panel file manager

Kube

Minimalistic and sufficient for everything, adaptive and responsiv CSS framework

Framework

Kubuntu

Official derivative of the Ubuntu operating system which uses the KDE Plasma Desktop instead of the Unity

L

Laravel

Free, open-source PHP web application framework, intended for development of MVC web applications

Open SourcePHP

Lazarus

Free cross-platform visual integrated development environment for Pascal

IDE

Lazy.js

Utility library for JavaScript, similar to Underscore and Lo-Dash with lazy evaluation

Library

Leaflet

Open-Source JavaScript Library for Mobile-Friendly Interactive Maps

JavaScriptLibraryOpen Source

LEAST.js

HTML 5 & CSS3 Gallery with LazyLoad as jQuery Plugin

HTML

LedgerSMB

Free software double entry accounting and Enterprise resource planning (ERP) system

Lepton

A high-performance, pluggable particle engine and API for Python

Python

G1

Less

CSS pre-processor

LESS Elements

Set of basic mixins for the LESS CSS pre-processor

libavg

High-level development platform for multimedia applications with Python

Python

libdash

Dynamic Adaptive Streaming over HTTP standard written in C++

libfixmath

Platform-independent fixed point maths library written in C

CLibrary

libLAS

C/C++ library for reading and writing LAS LiDAR format

Library

libpcap

Application programming interface (API) for capturing network traffic

LibreCAD

Free Computer Aided Design application for 2D design

CAD

Libremail

Free software suite for electronic mail processing

Processing

LibreOffice

Free and open source office suite

Open Source

LibrePlan

Free software web application for project management written in Java

Java

libSBML

Open-source software library that provides an API for the SBML

LibraryOpen Source

libsndfile

C library for reading and writing audio files

AudioCLibrary

libVLC

Media framework that can be embedded into an application to get multimedia capabilities

Framework

LibVNC

C libraries that allow to easily implement VNC server or client functionality in an application

C

libvorbis

General-purpose compressed audio format

Audio

Lightspark

Free and open source SWF player written in C and C++

COpen Source

lighttpd

Open-source web server optimized for speed-critical environments

Open Source

Linphone

Cross-platform, free VoIP application

Linux Mint

Linux distribution for desktop computers, based on either Ubuntu or Debian

Linux

G1

LinuxCNC

System that implements numerical control capability to control CNC machines

Lithium

Configurable framework for PHP

FrameworkPHP

Lua

Embeddable scripting language

Lua-httpd

LUA Networking Extension Library

LibraryLua

LuaRocks

Deployment and management system for Lua modules

Lua

Lubuntu

Lightweight Linux operating system based on Ubuntu but using the LXDE desktop environment

Linux

LucidDB

Database purpose-built to power data warehouses, OLAP servers and business intelligence systems

Database

LuxRender

Free and open source software rendering system for physically correct image synthesis

Open SourcePixel Graphics

LWJGL

The Lightweight Java Game Library that poweres Minecraft

JavaLibrary

LXDE

Free and open source desktop environment for Unix and other POSIX compliant platforms

Open Source

Lynx

Highly configurable text-based web browser for use on cursor-addressable character cell terminals

LyX

Open source document processor based on top of the LaTeX typesetting system

Open Source

M

Magento

Open source e-commerce web application

Open Source

Makehuman

Open source 3D computer graphics application designed for the prototyping of photo realistic humanoid

3D GraphicsOpen SourcePixel Graphics

Manjaro Linux

Linux distribution, with Xfce as its default user interface

GUILinux

Manta

Portable interactive ray tracing environment to be used on both workstations, clusters and super computers

Mantis

Free and open source, web-based bug tracking system written in PHP

PHP

Mapstraction

Javascript library that provides a single, common interface for a wide variety of Javascript map APIs

JavaScriptLibrary

MARF

The modular audio recognition framework

markItUp!

JavaScript plugin built on the jQuery library that turns any textarea into a markup editor

JavaScriptLibrary

MATE

Desktop environment forked from the now-unmaintained code base of GNOME 2

Math.js

Extensive math library for JavaScript and Node.js

JavaScriptLibrary

matplotlib

Python 2D plotting library

LibraryPython

Maximilian

C++ Audio and Music DSP Library

MediaWiki

Free and open source wiki software, used to power wiki websites such as Wikipedia

Open Source

meeus

Selected algorithms for Go from the book Astronomical Algorithms

melonJS

Lightweight JavaScript Game Engine

JavaScript

Mer

Free and open-source software distribution, middleware for Linux-based mobile-oriented operating systems

Open Source

Mercurial

Free, distributed source control management tool

Mesa

Free and open-source libraries that implement OpenGL

Open Source

MeshLab

Portable, and extensible system for the processing and editing of unstructured 3D triangular meshes

3D GraphicsProcessing

Meteor

Open source JavaScript web application framework

FrameworkJavaScriptOpen Source

microjs

Several tiny utility functions for JavaScript

JavaScript

middleclass

OOP library for Lua. It has inheritance, metamethods (operators), class variables and weak mixin support

Library

Midnight Commander

Visual file manager and Norton Commander clone

MinGW

Fee and open source development environment for native Microsoft Windows applications

Open SourceWindows

Minified.js

JavaScript library for DOM manipulation, animation, event and requests

JavaScriptLibrary

mintty

Free and open source terminal emulator for Cygwin

Open Source

MLPACK

Machine learning software library for C++

Library

Mobile Detect

Lightweight PHP class for detecting mobile devices

PHP

Modelio

Open Source UML tool

Open Source

Modernizr

JavaScript library that detects the availability of native implementations for next-generation Web Technologies

JavaScriptLibrary

Modest Maps

Small, extensible, and free library for JavaScript to create interactive maps

JavaScriptLibrary

MODX

Free, open source content management system and web application framework written in PHP

FrameworkOpen SourcePHP

MOEA Framework

Java library for developing and experimenting with multiobjective evolutionary algorithms

JavaLibrary

mojoPortal

Open source, cross-platform, CMS for ASP.NET which is written in C#

CMS

Mondo Rescue

Free disaster recovery software

G1

mongoDB

OpenSource Document Oriented Database

DatabaseOpen Source

Mongoose

Cross-platform web server written in C

C

Monkey

Cross-platform game Programming Language

Mono

Ecma standard-compliant, .NET compatible set of tools including a C# compiler and a CL Runtime

MonoDevelop

Open source integrated development environment for Linux, OS X and Windows

IDEOpen SourceWindows

mooTools

JavaScript Framework

FrameworkJavaScript

morris.js

Charts with JavaScript

JavaScript

Mozilla Thunderbird

Free, open source, cross-platform email, news, and chat client

MPlayer

Cross-platform Video Player

Video

Mscgen

Program that parses Message Sequence Chart descriptions and produces PNG, SVG, EPS or ismaps

Munee

PHP5.3 library JIT compile LESS, SCSS, or CoffeeScript, manipulate images, minify CSS and JS, and cache assets

Library

G1

Mustache

Simple Templating for many Languages and almost all platforms

Mutt

Text-based email client for Unix-like systems

MyCoRe

Digital asset management and presentation framework

N

Nagare

Open source web application framework for developing web applications in Stackless Python

FrameworkOpen SourcePython

NClass

Create UML class diagrams with full C# and Java

Java

NetBeans IDE

IDE to develop desktop, mobile and web applications with Java, HTML5, PHP, C/C++

IDE

Newton

Open-source integrated solution for real time simulation of physics environments

Open Source

Nginx

Open source reverse proxy server for HTTP, HTTPS, SMTP, POP3, and IMAP protocols

Open Source

nib

Library for the Stylus CSS language, providing robust cross-browser CSS3 mixins

Library

NicEdit

Lightweight, Cross Platform, Inline Content Editor written in JavaScript

JavaScript

Nightingale

Customizable cross-platform music player.

Audio

NINJA-IDE

Cross-platform integrated development environment designed to build Python applications

IDEPython

G1

Node.js

JavaScript for server side applications

JavaScript

Nodeclipse

Third-party solutions for Eclipse for programming in JavaScript, CoffeeScript with focus on Node.js

normalize.css

CSS consistency layer

nose2

The successor to nose, based on unittest2. Unit testing for Python

Python

Notepad++

Text editor and source code editor for Windows written in C++

Windows

NOVIUS OS

PHP Open Source Content Management System

Open SourcePHP

NuFW

Extension to Netfilter that adds authentication to filtering rules

Numba

NumPy aware dynamic Python compiler using LLVM

Python

Numeric.js

Library to perform sophisticated numerical computations in pure javascript

G1

NumPy

Package for scientific computing with Python

Python

nuxeo

Open Source Content Management Platform

Open Source

Nuxeo

Open source document management, case management and digital asset management

nvi

Re-implementation of the classic Berkeley text editor, ex/vi

O

OcempGUI

Contains a set of various user interface elements based on and for Pygame

GUI

ocPortal

Open source content management system written in PHP

Open SourcePHP

OCRFeeder

Document layout analysis and optical character recognition system

OCRopus

OCR system written in Python, NumPy, and SciPy

Octopress

Preconfigured Jekyll templates, CSS, JavaScript and configuration

ODE

C/C++ rigid body dynamics

G1

Ogre3D

Flexible scene-graph 3D engine written in C++

3D Graphics

Okular

Document viewer for KDE SC 4 based on KPDF

OmniAuth

OmniAuth is a flexible authentication system utilizing Rack middleware for Ruby

Ruby

Omnipay

Framework agnostic, multi-gateway payment processing library for PHP 5.3+

FrameworkLibraryPHPProcessing

Opauth

Enables PHP applications to do user authentication with ease

PHP

Open Workbench

Free project management software focused on scheduling for Windows

Windows

Openbox

Free, stacking window manager for the X Window System

OpenBSD

Unix-like computer operating system descended from Berkeley Software Distribution

OpenCms

Open source content management system written in Java

JavaOpen Source

G1

OpenCV

Cross-platform open-source computer vision library

LibraryOpen Source

OpenDAM

Open source digital library and project management software

OpenERP

Open-source enterprise resource planning software written in Python

Open SourcePython

Openfiler

Operating system that provides file-based network-attached storage and block-based storage area network

openFrameworks

Open source toolkit designed for artists and designers written in C++

Open Source

OpenFX

Open-Source 3D modeling, animation and rendering suite

3D GraphicsAnimationOpen Source

OpenJDK

Open-source JDK 7 for most popular Linux distributions

LinuxOpen Source

OpenLayers

OpenLayers is completely free, Open Source JavaScript Library for interactive maps

JavaScriptLibraryOpen Source

OpenLDAP

Free, open source implementation of the Lightweight Directory Access Protocol

Open Source

OpenSceneGraph

Open-source high performance 3D graphics toolkit written in C++

3D GraphicsOpen Source

OpenShot

Free and open-source non-linear video editing software package for Linux, built with Python

Open SourcePythonVideo

openSUSE

General purpose operating system built on top of the Linux kernel

Linux

OPUS

Open source document management solution

Orange

Component-based data mining and machine learning software suite

Orchard Project

Free, open source, community-focused content management system written in ASP.NET

osCommerce

E-commerce and online store-management software program written in PHP

PHP

OSG.JS

WebGL framework based on OpenSceneGraph concepts

Framework

OTB

Orfeo Toolbox is a library for remote sensing image processing

LibraryPixel GraphicsProcessing

P

Packer

Tool for creating identical machine images for multiple platforms from a single source configuration

Panda3D

Free 3D Game Engine

3D Graphics

Pantheios

Open source C/C++ logging API

Open Source

papaya CMS

Open source content management system with XSLT templating written in PHP

Open SourcePHP

Paper.js

Open source vector graphics scripting framework for JavaScript

Papyrus

Open Source UML 2 tool based on Eclipse

Open Source

PARI/GP

Computer algebra system with the main aim of facilitating number theory computations

Parsley.js

JavaScript forms validation

JavaScript

pattern

Python Web mining module, for scraping, language processing, machine learning and more

Python

PC-BSD

Unix-like, desktop-oriented operating system built upon the most recent releases of FreeBSD

pcc

Compiler for the C programming language

C

pChart

PHP class to build charts

PHP

PCL

Standalone, large scale, open project for 2D/3D image and point cloud processing

Pixel GraphicsProcessing

pdf.js

JavaScript library intended to render PDF files using the HTML5 Canvas

JavaScriptLibrary

PDFtk

Open source cross-platform tool for manipulating Portable Document Format

Open Source

pDLNA

UPnP and DLNA service which serves multimedia content to compatible clients on the network written in Perl

PDT

PHP Integrated Development Environment framework for the Eclipse platform

FrameworkIDEPHP

Pencil2D

Animation/drawing software for Mac OS X, Windows, and Linux.

Penlight

Set of pure Lua libraries focusing on input data handling

Lua

Peppermint Linux OS

Cloud-centric OS based on Lubuntu, a derivative of the Ubuntu Linux operating system using LXDE

Linux

PGU

Collection of useful modules for writing games with PyGame

PHP

Server-side scripting language

PHP Error

Error formatting and full syntax highlighting for PHP

PHP

PHP Excel Reader

PHP Library to read the binary format of XLS files

LibraryPHP

PHP-Fusion

Light-weight open-source content management system written in PHP

Open SourcePHP

phpDocumentor

Generate documentation from your PHP source code

PHP

phpFastCache

High-performance, distributed object caching system, generic in nature

phpgeo

Simple Geo Library for PHP

LibraryPHP

phpLiteAdmin

Open source tool written in PHP intended to handle the administration of SQLite

Open SourcePHPSQLite

PHPMailer

Full-featured email creation and transfer class for PHP

PHP

phpMyAdmin

Free and open source tool written in PHP intended to handle the administration of MySQL

MySQLOpen SourcePHP

phpThumb()

Uses the GD library to create thumbnails from images (JPEG, PNG, GIF, BMP, etc) on the fly

Library

Phraseanet

Open source solution for digital asset management

PhysicsFS

Programming library written in C for virtual file access

CLibrary

Pico

Open source flat file CMS for PHP

CMSOpen SourcePHP

Pidgin

Easy to use and free chat client

PIL

Python Imaging Library adds image processing capabilities to your Python interpreter

LibraryPixel GraphicsProcessingPython

Pillow

More user friendly fork of the Python Imaging Library

LibraryPython

Pimcore

Open source PHP web content management platform for creating and managing web applications

Open SourcePHP

Pinta

Open-source, cross-platform bitmap image drawing and editing program

Pixel Graphics

Pitivi

Free video editor

Video

PivotX

Open source Blog CMS written in PHP

CMSOpen SourcePHP

pixi.js

Fast HTML 5 2D rendering engine that uses webGL with canvas fallback written in JavaScript

HTMLJavaScript

Planetary.js

Interactive globes with JavaScript

JavaScript

PlayOnLinux

Graphical front-end for the Wine software compatibility layer

Plone

Free and open source content management system built on top of the Zope application server

Open Source

POCO C++

Collection of open source class libraries for developing network-centric, portable applications in C++

Open Source

Polymaps

Free JavaScript library for making dynamic, interactive maps

JavaScriptLibrary

PostBooks

Open source accounting and enterprise resource planning business system

Open Source

Postfix

Free and open-source mail transfer agent

Open Source

POV-Ray

Persistence of Vision Raytracer is a Free Software tool for creating three-dimensional graphics.

PowerVR Insider SDK

Cross-platform toolkit designed to support all aspects of 3D graphics application development

3D Graphics

Prado

Component-based and event-driven programming framework for PHP

FrameworkPHP

PrestaShop

Open source e-commerce solution based in PHP

Open SourcePHP

Processing

Fun to use Programming Language

Processing.js

Processing Programming Language for JavaScript Environements

JavaScriptProcessing

ProcessWire

Open source content management framework build with PHP

FrameworkOpen SourcePHP

Profound Grid

Responsive grid system for fixed and fluid layouts, built in SCSS

PROJ.4

Library for performing conversions between cartographic projections

Library

ProjectLibre

Open source project management software written in Java

JavaOpen Source

Prototype

According to Wikipedia one of the most popular JavaScript Frameworks around

JavaScript

Psi

Free instant messaging client for the XMPP protocol

Pure

Set of small, responsive CSS modules

Pure Data

Visual programming language developed for creating interactive computer music

Audio

PureMVC

Model, View and Controller Framework for many different Languages

Framework

pybox2d

2D physics library for Python

LibraryPython

PyCAM

Toolpath generator for 3-axis CNC machining

PyDev

Third-party plug-in for Eclipse to make it support Python Development

Python

PyEphem

Scientific-grade astronomical computations for the Python programming language

Python

pyglet

Cross-platform windowing and multimedia library for Python

LibraryPython

PyGTK

GTK+ for Python, create programs with a graphical user interface using Python

GUIPython

pyirrlicht

Python ctypes module for the Irrlicht Engine SDK for 2d/3d games and graphics

Python

Pyjamas

Framework for developing the client-side of Ajax-based applications in Python

FrameworkPython

Pylint

Python code validation

Python

Pylons Framework

Open source Web application framework written in Python

FrameworkOpen SourcePython

pymunk

Easy-to-use pythonic 2d physics library

Library

PyODE

Open-source Python bindings for The Open Dynamics Engine

Open SourcePython

PyOpenGL

Most common cross platform Python binding to OpenGL and related APIs

Python

PyPy

Python interpreter and just-in-time compile

Python

PyQt

Python binding of the cross-platform GUI toolkit Qt

GUIPython

pyquery

Make jquery queries on xml documents with Python

Python

Pyramid

Open source web framework written in Python based on WSGI

FrameworkOpen SourcePython

Pyrex

Programming language developed to create Python modules

Python

Python-Ogre

Python binding for the OGRE 3D engine

3D GraphicsPython

pywin32

Python for Windows extensions

PythonWindows

Q

QCad

Free CAD software application for 2D design and drafting

CAD

QGL

Simple 2D scenegraph with an OpenGL render engine

qooxdoo

JavaScript Framework

FrameworkJavaScript

QT

C++ Cross-platform application and UI framework.

GUI

QT Creator

Code editor with C++, QML and ECMAscript support

Qtstalker

Qtstalker is a user friendly Technical Analysis package for GNU/Linux

QuantLib

A free, open-source library for quantitative finance

LibraryOpen Source

QUnit

JavaScript unit testing framework

FrameworkJavaScript

Quod Libet

Cross-platform free and open-source music player, tag editor and library organizer written in Python

AudioLibraryOpen SourcePython

QuteCom

Free software SIP compliant VoIP client

R

R

Free software programming language and software environment for statistical computing and graphics

Radiant

Ruby open source content management system designed for small teams

Open SourceRuby

Raphaël

JavaScript Vector Graphics Library

JavaScriptLibraryVector Graphics

Ratchet

Prototype iPhone apps with simple HTML, CSS, and JS components

JavaScript

Ratchet

PHP library to let developers create real-time, bi-directional apps between clients and servers over WebSockets

LibraryPHP

ratpoison

Minimalistic tiling window managers for the X Window System

Razuna

Open Source digital asset management

DAMOpen Source

Recline.js

Library for building data applications in pure Javascript and HTML

HTMLJavaScriptLibrary

redigo

Go client for Redis

Redis

Open source, BSD licensed, advanced key-value store

Linux

Refinery CMS

Open source content management system written in Ruby

Open SourceRuby

Replicant

Free and open source operating system based on the Android mobile platform

Open Source

Requests for PHP

HTTP request library

Library

RequireJS

JavaScript file and module loader.

JavaScript

Resin

Web server and Java application server

Java

ResourceSpace

Open source digital asset management software

retina.js

Open source script that makes it easy to serve high-res images to devices with high-res displays

Open Source

Revel

Web framework for the Go language

Framework

Rhino

Open source JavaScript engine written in Java

JavaJavaScriptOpen Source

Rope

Python refactoring library

LibraryPython

ROS

Robot Operating System is a set of software libraries and tools that help you build robot applications

ROSE

Compiler infrastructure to generate analyzers and translators for multiple source languages

Roundcube

Web-based IMAP email client written in PHP

PHP

Roundup

Open source issue or bug tracking system written in Python

Open SourcePython

RQDA

R package for computer assisted qualitative data analysis or CAQDAS

RT

Ticket-tracking system written in Perl

Ruby

Dynamic, open source programming language

Open Source

Ruby on Rails

Full-stack framework for the Ruby programming language

FrameworkRuby

S

Salome

Free software that provides a generic platform for Pre- and Post-Processing for numerical simulation

Samba

Free software re-implementation of the SMB/CIFS networking protocol

Sammy.js

Restful event based JavaScript framework

FrameworkJavaScript

G1

Sass

CSS extension language

Sassaparilla

Flexible CSS stylesheets using Sass via SCSS and Compass

Scapy

Packet manipulation tool for computer networks, written in Python

Python

scikit-learn

Simple and efficient tools for data mining and data analysis written in Python

Python

Scilab

Open-source, cross-platform numerical computational package and a high-level programming language

Scintilla

Free library that provides text-editing functions written in C++

Library

G1

SciPy

Python-based ecosystem of open-source software for mathematics, science, and engineering

Open Source

Sco.js

Twitter bootstrap JavaScript extension to improve extensibility

JavaScript

SCons

Python Software construction tool that analyzes source code file dependencies and os adaptation requirements

Python

Scout

Scout runs Sass and Compass in a self-contained Ruby environment,

Ruby

Scrapy

Fast high-level screen scraping and web crawling framework for Python

FrameworkPython

Scribus

Open Source Desktop Publishing

Open Source

script.aculo.us

JavaScript Framework focussed on GUI Development

FrameworkGUIJavaScript

SDCC

Partially retargetable C compiler for microcontrollers

C

G1

SDL

Simple DirectMedia Layer is a cross-platform development library written in C

CLibrary

Seam

Web application framework for Java

FrameworkJava

Seed

JavaScript interpreter and a library of the GNOME project

JavaScriptLibrary

Semantic GRID SYSTEM

CSS Page layout Framework

Framework

Serendipity

Blog and web-based content management system written in PHP

PHP

sh

Full-fledged subprocess interface for Python that allows you to call any program as if it were a function

Python

Shed Skin

Python to C++ programming language compiler

Python

ShellWrap

PHP wrapper for using the command-line

PHP

Sigma

JavaScript library dedicated to graph drawing

JavaScriptLibrary

SilverStripe

Free and open source Content Management System written in PHP

Open SourcePHP

Sinatra

Free and open source software web application library and domain-specific language written in Ruby

LibraryOpen SourceRuby

Skeleton

Small collection of CSS files that can help you rapidly develop sites

Skulpt

Entirely in-browser implementation of Python written in JavaScript

Sky

Open source database used for flexible, high performance analysis of behavioral data

DatabaseOpen Source

Slackware

Free and open source Linux distribution

LinuxOpen Source

G1

Slim

Cute little PHP Framework to build RESTful Services

FrameworkPHP

Slut

Python Programming framework for generative, synthetic, interactive, network-enabled graphics

FrameworkPython

SMALL C

C language compiler that is available with source code

C

SmartClient

Ajax framework

Framework

Smarty

Web template system written in PHP

PHP

Snap.js

A Library for creating mobile shelfs in JavaScript

JavaScriptLibrary

Snap.svg

JavaScript SVG library

JavaScriptLibrary

SnapEditor

Online HTML5 WYSIWYG Editor written in JavaScript

JavaScript

Snappy

PHP5 library allowing thumbnail, snapshot or PDF generation from a url or a html page

HTMLLibraryPHP

SocialFeed.js

Generate a social feed in JavaScript

JavaScript

Socialite v2

JavaScript Library providing social sharing buttons

JavaScriptLibrary

Socket.IO

JavaScript library for realtime web applications, including client and node.js libs

JavaScriptLibrary

SOGo

Open source collaborative software server with a focus on simplicity and scalability

Open Source

Source Filmmaker

Video capture and editing application that works from inside the Source game engine

Video

SoX

Free cross-platform digital audio editor written in C

AudioC

Soya 3D

Object oriented "high level" 3D engine for Python

3D GraphicsPython

SPDY

Library for building clients and servers, in Go

Library

Sphinx

Python Documentation Generator

Python

Spine

Lightweight JavaScript MVC application development framework

FrameworkJavaScript

SPIP

Free PHP content management system

PHP

Spree Commerce

Open source e-commerce solution based on Ruby on Rails

Open SourceRuby

Spring Framework

Programming and configuration model for Java-based applications

Spring Roo

Rapid application development tool for Java developer

Java

SproutCore

JavaScript open-source framework

FrameworkJavaScriptOpen Source

Spyder

Open source cross-platform IDE for scientific programming in the Python language

IDEOpen SourcePython

SPyRE

Simple Pythonic Rendering Engine

SQL-Ledger

ERP and double entry accounting system

SQLAlchemy

Open source SQL toolkit and object-relational mapper (ORM) for Python

DatabaseOpen SourcePython

SteamOS

Debian Linux-based operating system in development by Valve Corporation

Storm

Object-relational mapper for Python

Python

StreamTable.js

JavaScript Library that treams data for tables in the background

JavaScriptLibrary

Stripes

Open source Java web application framework based on the MVC pattern

FrameworkJavaOpen Source

stroll.js

JavaScript library for CSS3 scroll effects

JavaScriptLibrary

Stylus

Expressive CSS language for nodejs

Subsonic

Free, web-based media streamer

SuiteCRM

Free and open source alternative to SugarCRM Professional Edition

Open Source

SuperCollider

Programming language for real time audio synthesis

Audio

Susy

Responsive grids for the Compass CSS Authoring Framework

Framework

svg.js

Lightweight JavaScript library for manipulating and animating SVG

JavaScriptLibrary

SVGAlib

SVGAlib is an open-source low-level graphics library which runs on Linux and FreeBSD

LibraryLinuxOpen Source

Swift Mailer

Feature-rich PHP Mailer

PHP

SWIG

Tool that connects programs written in C and C++ with a variety of high-level programming languages

C

SWT

Graphical widget toolkit for use with the Java platform

Java

Sylpheed

Open source e-mail client and news client

Open Source

Symfony

PHP web application framework for MVC applications

FrameworkPHP

sympy

Computer algebra system written in pure Python

Python

Synfig Studio

Free and open-source 2D animation software

AnimationOpen Source

T

TA-Lib

Technical analysis of financial market data

TACTIC

Digital asset management system written in Python

DAMPython

TCC

The Tiny C Compiler is a x86, x86-64 and ARM processor C compiler

C

Tesseract

Accurate open source OCR engine

TestDisk

Free data recovery software

Textpattern

Open source content management system build on PHP

Open SourcePHP

three.js

JavaScript 3D library with software and WebGL rendering support

3D GraphicsJavaScriptLibrary

thttpd

Open source software web server

Open Source

Tiki

Open source wiki-based, content management system and Online office suite written primarily in PHP

Open SourcePHP

TiMidity++

Software synthesizer that can play MIDI files

TinyMCE

Platform independent web based Javascript HTML WYSIWYG editor

HTMLJavaScript

Tk

Open source, cross-platform widget toolkit written in C

C

Tntnet

Web server software, coded in C++

Tomahawk

Multi source music player

Audio

Topcoat

CSS GUI Framework

FrameworkGUI

Tornado

Non-blocking web server and web application framework written in Python

FrameworkPython

Torque 3D

Open source 3D Engine that supports Windows and Browser-based web deployment out of the box. Featuring Oculus Rift support.

TR

JavaScript Library to apply CSS based on the text rasterizer and antialiasing your browser is using

JavaScriptLibrary

Traverso DAW

Cross-platform multitrack audio recording and audio editing

Audio

Tryton

General purpose application platform on top of which is built an ERP, all written in Python

Python

TurboCASH

Free software accounting software package written in Delphi

TurboGears

Python web application framework consisting of several WSGI components

FrameworkPython

TWIG

Fast PHP Template Engine

PHP

Twisted

Event-driven network programming framework written in Python

FrameworkPython

Typeplate

Typeplate is a typographic starter kit using CSS, SASS or Bower

TypeScript

Language for application-scale JavaScript development

JavaScript

G1

TYPO3

They call it the Enterprise Open Source CMS, it is written in PHP

Open SourcePHP

TYPO3 Flow

Open source web application framework written in PHP

FrameworkOpen SourcePHP

U

Ubench

Micro PHP benchmark library

LibraryPHP

Ubuntu

Debian-based Linux operating system, with Unity as its default desktop environment

Linux

Ubuntu Touch

Mobile version of the Ubuntu operating system

UIJI.JS

jQuery Plugin to create jQuery elements inline

UIZE

JavaScript OOP Framework

FrameworkJavaScript

Ultimate++

C++ cross-platform rapid application development framework

Framework

Umbraco

Open source content management system written in C#

Open Source

UMFPACK

Set of routines for solving unsymmetric sparse linear systems written in C

C

Underscore

JavaScript library which provides utility functions for common JavaScript tasks

JavaScriptLibrary

unirest

Lightweight HTTP Request Client Libraries

unison.js

Plugin to declare named breakpoints and automatically sync them across your JavaScript and markup

JavaScript

Unity

Cross-platform game development, including IDE and Engine

IDE

Unsemantic

CSS framework built using Sass and Compass

Framework

Upload

PHP Library to simplify file validation and uploading

LibraryPHP

URI.js

JavaScript library for working with URLs

JavaScriptLibrary

V

G1

V8

JavaScript Engine is an open source JavaScript engine developed by Google

JavaScriptOpen Source

Validation

Validation engine for PHP

PHP

Verify.js

Customizable asynchronous form validation library for JavaScript

JavaScriptLibrary

verlet-js

A simple Verlet physics engine written in javascript

JavaScript

Video.js

JavaScript and CSS library that makes it easier to work with and build on HTML5 video

JavaScriptLibraryVideo

VirtueMart

Open source e-commerce solution designed as an extension of the Mambo or Joomla!

Open Source

Vitess

Set of servers and tools meant to facilitate scaling of MySQL databases

MySQL

VLC

Portable, free and open-source, cross-platform media player and streaming media server

VLMC

VideoLAN Movie Creator is a non-linear editing software for video creation based on libVLC

Video

voix.js

JavaScript library to add voice commands to your sites, apps or games

JavaScriptLibrary

W

w3m

Free software/open source text-based web browser

Watchdog

Python API library and shell utilities to monitor file system events

LibraryPython

WaveMaker

Rapid application development environment for building web applications with Java

Java

web2py

Open source web application framework written in the Python

FrameworkOpen SourcePython

Webalizer

Application that generates web pages of analysis, from access and usage logs

webERP

Open source ERP system for Small and Medium-sized Enterprise

Open Source

webix

Yet another GPL or buy JavaScript Framework

FrameworkJavaScript

Weka

Machine learning software written in Java

Java

whoops

PHP library that deals with errors and exceptions

LibraryPHP

WildFly

Application server written in Java, formerly known as JBoss

Wine

Windows compatible runtime Environment for POSIX compatible operating systems

LinuxWindows

Wings 3D

Advanced subdivision modeler

WinPcap

Network traffic capture for Windows

Windows

Wiring

Wiring is an open-source programming framework for microcontrollers

FrameworkOpen Source

Wolf CMS

Light-weight PHP content management system

PHP

WooCommerce

Open source e-commerce plugin for WordPress written in PHP

Open SourcePHP

G1

WordPress

Run your blog with PHP based WordPress

PHP

Wt

Open source widget-centric web application framework for C++

FrameworkOpen Source

wxFormBuilder

Open source GUI designer application for wxWidgets toolkit

GUIOpen Source

wxGlade

A program for creating wxWidgets GUIs written in Python

Python

wxHaskell

Portable and native GUI library for Haskell, built on wxWidgets

GUILibrary

wxPerl

Perl wrapper for the wxWidgets GUI toolkit

GUI

wxPHP

PHP extension that wraps the wxWidgets library

LibraryPHP

wxPython

Python wrapper for the wxWidgets GUI toolkit

GUIPython

wxWidgets

Cross-platform GUI Library written in C++

GUILibrary

X

x264

Free software library for encoding video streams into the H.264/MPEG-4 AVC compression format

LibraryVideo

XEmacs

Graphical, console-based text editor which runs on almost any Unix-like operating system and Windows

Windows

Xfce

Free software desktop environment for Unix and Unix-like platforms

Xfig

Free and open source vector graphics editor

Open SourceVector Graphics

XForms Toolkit

Graphical user interface toolkit for X based on the X11 Xlib library

GUILibrary

xine

Multimedia playback engine for Unix-like operating systems

XnView

Software for reading, viewing, and processing images

Processing

XOOPS

Free open source content management systems, written in PHP

Open SourcePHP

Xpdf

Open-source PDF viewer for the X Window System and Motif

Open Source

Xubuntu

Community maintained derivative of the Ubuntu operating system using Xfce instead of Unity

Y

YafaRay

Free open-source raytracing engine

Open Source

YAML

Modular CSS framework for flexible, accessible and responsive websites

Framework

YARD

Ruby Documentation Tool

Ruby

Yesod

Free web application framework based on Haskell

Framework

Yii

Object-oriented, component-based MVC PHP web application framework

FrameworkPHP

yo

CLI tool for scaffolding out Yeoman projects

YUI

Another JavaScript RIA library

JavaScriptLibrary

Z

Zebra_Image

Lightweight image manipulation library written in PHP

LibraryPHPPixel Graphics

Zen Cart

PHP based online store management system

PHP

Zend Framework

Everything included Framework for PHP

FrameworkPHP

ZenTrack

Open source bug tracking system written in PHP

Open SourcePHP

Zikula

Open source web application framework for PHP

FrameworkOpen SourcePHP

Zope

Free and open-source, object-oriented web application server written in Python

Python

Zopfli

Open source, zlib-compatible data compression library

Library

ZynAddSubFX

Free open source software synthesizer for Linux, Mac OS X and Microsoft Windows

Open SourceWindows