- MySQL
- The world's most popular open source database.
- PostgreSQL
- The world's most advanced open source database.
- Eclipse
- A software platform comprising extensible application frameworks, tools and a runtime library for software development and management.
- Dia
- A GTK+ based diagram creation program for Linux, Unix and Windows.
- sIFR
- Scalable Inman Flash Replacement, a technology that allows you to replace text elements on screen with Flash equivalents.
- The Yahoo! User Interface Library (YUI)
- A set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX.
- jQuery
- A fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development.
- Dojo
- A very lightweight and yet powerful JavaScript toolkit.
- MooTools
- A compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer. It allows you to write powerful, flexible, and cross-browser code with its elegant, well documented, and coherent API.
- Symfony
- Open source PHP MVC framework.
- Subversion
- An open source version control system.
- Blender
- Free open source 3D content creation suite, available for all major operating systems.
- HighSlide
- Highslide JS is an open source JavaScript software, offering a Web 2.0 approach to popup windows.
- Smarty
- Template/Presentation Framework.
- Cheetah
- Cheetah is an open source template engine and code generation tool, written in Python.
- OpenNMS
- OpenNMS is the world's first enterprise grade network management platform.
- OpenCM
- OpenCM is designed as a secure, high-integrity replacement for CVS.
- Elgg
- An open source social networking platform.
- ohloh
- Open Source Project Listings.
- LAME
- LAME is a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL.
- GD Library
- GD is an open source code library for the dynamic creation of images by programmers.
- WordPress
- WordPress is a free state-of-the-art publishing platform with a focus on aesthetics, web standards, and usability.
- Mambo
- Mambo is a full-featured, award-winning content management system that can be used for everything from simple websites to complex corporate applications.
- SPIP
- SPIP is a publishing system for the Internet in which great importance is attached to collaborative working, to multilingual environments, and to simplicity of use for web authors.
- PHP-Fusion
- A light-weight open-source content management system (CMS) written in PHP.
- RoundCube
- RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface.
- Movable Type
- All-in-One Social Publishing Platform.
- MediaWiki
- MediaWiki is a free software wiki package originally written for Wikipedia.
- Dolphin
- Social networking platform.
- Inkscape
- An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw.
- OpenGL
- The Industry Standard for High Performance Graphics.
- WYMeditor
- A web-based WYSIWYM (What You See Is What You Mean) XHTML editor.
- dimdim
- Web conferencing platform.
- moodle
- A free, Open Source software package designed using sound pedagogical principles, to help educators create effective online learning communities.
- LightTPD
- A webserver designed and optimized for high performance environments.
- CherryPy
- A pythonic, object-oriented HTTP framework.
- Red5
- Open Source Flash Server.
- openwebspider
- An open source web spider.
- OpenFTS
- An advanced PostgreSQL-based search engine that provides online indexing of data and relevance ranking for database searching.
- Sphinx
- Free open-source SQL full-text search engine.
- SIMILE
- SIMILE is focused on developing robust, open source tools that empower users to access, manage, visualize and reuse digital assets.
- SWiK
- SWiK is a community driven resource for open source software. SWiK contains information and news about thousands of open source projects and people are constantly adding cool new stuff.
- Relay
- An AJAX directory manager.
- ZK
- A leading open source Ajax and mobile framework designed to maximize enterprises operation efficiency and minimize the development cost.
- XORP
- Industry's only extensible open source routing platform.
- Opte project
- This project was created to make a visual representation of a space that is very much one-dimensional, a metaphysical universe.
- JoomlaCode.org
- A resource for developers to build and manage Open Source software projects centred around Joomla.
- Redefine God
- An Open-Source Spirituality social-network (Religion 2.0).
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