A

accounting.js

Tiny JavaScript library for number, money and currency formatting

JavaScriptLibrary

AdaptCMS

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

PHP

Ampache

Web based audio/video streaming application and file manager

AngularJS

Googles JavaScript MVC Framework for DOM Manipulation

FrameworkJavaScript

Anima.js

Lightweight JavaScript animation library

AnimationJavaScriptLibrary

Annotator

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

JavaScriptLibraryOpen Source

Apache HTTP Server

Widespread web server application

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

Assetic

Asset management framework for PHP

DAMFrameworkPHP

Async.js

Async JavaScript utilities for node and the browser

JavaScript

B

Backbone.js

Lightweight MVP Library for JavaScript

JavaScriptLibrary

Batavi

Open source webshop written in PHP

Open SourcePHP

Beamer

LaTeX document class for creating slides for presentations

Behave.js

Lightweight library for adding IDE style behaviors to plain text areas

IDELibrary

Bespoke.js

Super minimal modular presentation library for JavaScript

JavaScriptLibrary

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

BlueGriffon

WYSIWYG content editor for the World Wide Web based on Gecko

Bonsai

Lightweight graphics library with SVG renderer to use with JavaScript

JavaScriptLibrary

Breeze

JavaScript library that helps you manage data in rich client applications

JavaScriptLibrary

Buzz

Lightweight PHP 5.3 library for issuing HTTP requests

LibraryPHP

C

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

Cesium

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

3D GraphicsJavaScriptLibrary

Chaplin

Architecture for JavaScript applications using the Backbone.js library

JavaScriptLibrary

Chart.js

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

JavaScript

Chartkick.js

Javascript charts with minimal code

JavaScript

chemicalize.org

Free chemical structure miner and web search engine written in PHP

PHP

ChocolateChip-UI

JavaScript framework for making mobile Web apps built on jQuery

FrameworkJavaScript

Cinelerra

Video editor and compositor for Linux

LinuxVideo

Cinelerra-CV

Community Version of the Cinelerra video editor and compositor

Video

CiviCRM

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

PHP

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

CMS Made Simple

Open source content management system for PHP

Open SourcePHP

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

ColorJizz

PHP library for manipulating and converting colors

LibraryPHP

ColtJS

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

FrameworkJavaScript

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

controlP5

Widespread GUI for Processing Apps

GUIProcessing

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

Crossfilter

JavaScript library for exploring large multivariate datasets

JavaScriptLibrary

CryptoJS

Collection of standard and secure cryptographic algorithms implemented in JavaScript

JavaScript

CTS

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

HTMLJavaScript

Cygwin

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

Windows

D

D3

JavaScript library for manipulating documents based on data

JavaScriptLibrary

datamock.js

Add mock data to your mockups using JavaScript

JavaScript

Dataset

JavaScript client-side data transformation and management library

JavaScriptLibrary

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

DISPATCH

PHP micro-framework

PHP

dojo

OpenSource modular JavaScript Toolkit

JavaScriptOpen Source

doT.js

Concise javascript template engine for Node.js and browsers

JavaScript

Dotclear

Open source PHP blog publishing application

Open SourcePHP

Drupal

Just another widespread Web CMS written in PHP

CMSPHP

E

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

Ekiga

VoIP and video conferencing application for GNOME and Windows

VideoWindows

Ember.js

JavaScript Web Application Framework

FrameworkJavaScript

Enyo

Open-source JavaScript framework for cross-platform Applications

FrameworkJavaScriptOpen Source

Eric

Full featured Python and Ruby editor and IDE

IDEPythonRuby

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

Faker

PHP library that generates fake data for you

LibraryPHP

Fat-Free Framework

Open source web application framework for PHP

FrameworkOpen SourcePHP

G1

FFmpeg

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

AudioVideo

Filterus

Flexible PHP 5.3 filter package

PHP

FITVIDS.JS

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

Video

FlashDevelop

Open Source ActionScript and Haxe IDE

ActionScriptIDEOpen Source

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

FPSMeter

Simple JavaScript library for themable FPS meter

JavaScriptLibrary

FreeCAD

General purpose 3D CAD modeler

3D GraphicsCAD

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

G

Gantti

Simple PHP Gantt Class

PHP

Gaufrette

PHP5 library that provides a filesystem abstraction layer

LibraryPHP

Geeklog

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

Open SourcePHP

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

gif.js

JavaScript GIF encoding library

JavaScriptLibrary

GLFW

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

LibraryWindows

Glow

JavaScript DOM Manipulation

JavaScript

gmaps.js

Google Maps in a simple way for JavaScript

JavaScript

gogeos

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

Library

Google Maps API

Official Google Maps API for JavaScript

JavaScript

Goutte

Simple PHP Web Scraper

PHP

GPS

GNAT Programming Studio free IDE

IDE

GRUNT

JavaScript Task Runner

JavaScript

GSAP

Animation Library for JavaScript and ActionScript

ActionScriptAnimationJavaScriptLibrary

GWT

Googles Web Toolkit for JavaScript RIA Development

JavaScript

H

Habari

Open source blog engine written in PHP

Open SourcePHP

Hammer.js

JavaScript library for multi-touch gestures

JavaScriptLibrary

HandBrake

Video Converter

Video

Handlebars

Semantic mustache style templates with JavaScript

JavaScript

HardonCollider

Lua module to simplify collision detection

Lua

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

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

Holder.js

Renders image placeholders entirely on the client side using JavaScript

JavaScriptPixel Graphics

HTMLPurifier

Standards-compliant HTML filter library written in PHP

HTMLLibraryPHP

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

I

Idiorm

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

PHP

ImageCache

PHP Image Compression & Caching

PHPPixel 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

Intro.js

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

JavaScriptLibrary

iptables

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

Linux

J

Jamroom

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

Open SourcePHP

Jasmine

Open source testing framework for JavaScript

FrameworkJavaScriptOpen Source

JavaScriptMVC

Open-source JavaScript MVC framework

FrameworkJavaScriptOpen Source

Jitsi

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

Open Source

Joomla!

Extendible PHP Web CMS

CMSPHP

jqmPhp

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

HTMLPHP

G1

jQuery

Widespread JavaScript Library

JavaScriptLibrary

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

Jsonlite

JSON without Quotes for JavaScript

JavaScriptJSON

JSZip

Create, read and edit .zip files with JavaScript

JavaScript

K

K-3D

3D modeling and animation software

3D GraphicsAnimation

Kajona

PHP5 based content management framework

FrameworkPHP

Kartograph

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

FrameworkJavaScriptPython

KDevelop

Open source IDE for Linux

IDELinuxOpen Source

KineticJS

HTML5 Canvas JavaScript framework for animations

FrameworkJavaScript

KineticJS

HTML5 Canvas JavaScript framework

FrameworkJavaScript

knockout.js

JavaScript UI framework

FrameworkGUIJavaScript

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

Leaflet

Open-Source JavaScript Library for Mobile-Friendly Interactive Maps

JavaScriptLibraryOpen Source

LibreCAD

Free Computer Aided Design application for 2D design

CAD

libSBML

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

LibraryOpen Source

Lithium

Configurable framework for PHP

FrameworkPHP

M

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

markItUp!

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

JavaScriptLibrary

Math.js

Extensive math library for JavaScript and Node.js

JavaScriptLibrary

melonJS

Lightweight JavaScript Game Engine

JavaScript

Meteor

Open source JavaScript web application framework

FrameworkJavaScriptOpen Source

microjs

Several tiny utility functions for JavaScript

JavaScript

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

Mobile Detect

Lightweight PHP class for detecting mobile devices

PHP

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

MonoDevelop

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

IDEOpen SourceWindows

mooTools

JavaScript Framework

FrameworkJavaScript

morris.js

Charts with JavaScript

JavaScript

MPlayer

Cross-platform Video Player

Video

N

NetBeans IDE

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

IDE

NicEdit

Lightweight, Cross Platform, Inline Content Editor written in JavaScript

JavaScript

NINJA-IDE

Cross-platform integrated development environment designed to build Python applications

IDEPython

G1

Node.js

JavaScript for server side applications

JavaScript

Notepad++

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

Windows

NOVIUS OS

PHP Open Source Content Management System

Open SourcePHP

O

ocPortal

Open source content management system written in PHP

Open SourcePHP

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

Openfiler

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

OpenFX

Open-Source 3D modeling, animation and rendering suite

3D GraphicsAnimationOpen Source

OpenLayers

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

JavaScriptLibraryOpen Source

OpenShot

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

Open SourcePythonVideo

osCommerce

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

PHP

P

Packer

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

papaya CMS

Open source content management system with XSLT templating written in PHP

Open SourcePHP

Parsley.js

JavaScript forms validation

JavaScript

pChart

PHP class to build charts

PHP

pdf.js

JavaScript library intended to render PDF files using the HTML5 Canvas

JavaScriptLibrary

PDT

PHP Integrated Development Environment framework for the Eclipse platform

FrameworkIDEPHP

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

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

Pico

Open source flat file CMS for PHP

CMSOpen SourcePHP

Pimcore

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

Open SourcePHP

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

Polymaps

Free JavaScript library for making dynamic, interactive maps

JavaScriptLibrary

G1

PostgreSQL

And you thought MySQL is free Software?

MySQL

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.js

Processing Programming Language for JavaScript Environements

JavaScriptProcessing

ProcessWire

Open source content management framework build with PHP

FrameworkOpen SourcePHP

Prototype

According to Wikipedia one of the most popular JavaScript Frameworks around

JavaScript

Pyjamas

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

FrameworkPython

python-dateutil

Provides powerful extensions to the standard datetime module

pywin32

Python for Windows extensions

PythonWindows

Q

QCad

Free CAD software application for 2D design and drafting

CAD

qooxdoo

JavaScript Framework

FrameworkJavaScript

QUnit

JavaScript unit testing framework

FrameworkJavaScript

R

Raphaƫl

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

Recline.js

Library for building data applications in pure Javascript and HTML

HTMLJavaScriptLibrary

RequireJS

JavaScript file and module loader.

JavaScript

Rhino

Open source JavaScript engine written in Java

JavaJavaScriptOpen Source

Roundcube

Web-based IMAP email client written in PHP

PHP

S

Salome

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

Sammy.js

Restful event based JavaScript framework

FrameworkJavaScript

Scintilla

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

Library

Sco.js

Twitter bootstrap JavaScript extension to improve extensibility

JavaScript

script.aculo.us

JavaScript Framework focussed on GUI Development

FrameworkGUIJavaScript

Seed

JavaScript interpreter and a library of the GNOME project

JavaScriptLibrary

Serendipity

Blog and web-based content management system written in PHP

PHP

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

G1

Slim

Cute little PHP Framework to build RESTful Services

FrameworkPHP

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

Source Filmmaker

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

Video

Spine

Lightweight JavaScript MVC application development framework

FrameworkJavaScript

SPIP

Free PHP content management system

PHP

SproutCore

JavaScript open-source framework

FrameworkJavaScriptOpen Source

Spyder

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

IDEOpen SourcePython

StreamTable.js

JavaScript Library that treams data for tables in the background

JavaScriptLibrary

stroll.js

JavaScript library for CSS3 scroll effects

JavaScriptLibrary

SuperCollider

Programming language for real time audio synthesis

Audio

svg.js

Lightweight JavaScript library for manipulating and animating SVG

JavaScriptLibrary

Swift Mailer

Feature-rich PHP Mailer

PHP

Symfony

PHP web application framework for MVC applications

FrameworkPHP

Synfig Studio

Free and open-source 2D animation software

AnimationOpen Source

T

Textpattern

Open source content management system build on PHP

Open SourcePHP

three.js

JavaScript 3D library with software and WebGL rendering support

3D GraphicsJavaScriptLibrary

Tiki

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

Open SourcePHP

TinyMCE

Platform independent web based Javascript HTML WYSIWYG editor

HTMLJavaScript

TR

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

JavaScriptLibrary

TWIG

Fast PHP Template Engine

PHP

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

UIZE

JavaScript OOP Framework

FrameworkJavaScript

Underscore

JavaScript library which provides utility functions for common JavaScript tasks

JavaScriptLibrary

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

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

Vitess

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

MySQL

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

webix

Yet another GPL or buy JavaScript Framework

FrameworkJavaScript

whoops

PHP library that deals with errors and exceptions

LibraryPHP

Wine

Windows compatible runtime Environment for POSIX compatible operating systems

LinuxWindows

WinPcap

Network traffic capture for Windows

Windows

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

wxPHP

PHP extension that wraps the wxWidgets library

LibraryPHP

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

XOOPS

Free open source content management systems, written in PHP

Open SourcePHP

Y

Yii

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

FrameworkPHP

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

ZynAddSubFX

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

Open SourceWindows