fiftyfifty is a programming language and game
Zap Engine
A web based helpdesk, ticket system & IT Service Management Solution
Free MMORPG Engine. Develop and host graphical browser-based games.
Tetris by Physics
keyword search engine for semi-structured data (Tables, lists,...)
A Game Built with Unity Game Engine
Open Source Web Template Engine for PHP
Tikal Online - 3D MMORPG (Torque/Python)