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A fantasy RPG game available for Linux, FreeBSD and BeOS. MacOS and Windows support will come soon.

Features several open-source games.

Web-based, multi-player space exploration and strategy game (PHP) [OS Independent].

Developing an Open Source strategy game based on Sid Meier's Civilization II. Public project.

Danger from the deep (aka dangerdeep) is a Free / Open Source World War II german submarine simulation. [Linux / Windows] (C++)

A massive multiplayer space trading and combat game for Linux. [GPL]

2D single player space strategy, combat, and trading game. (C++) [OS Independent]

The FlightGear flight simulator project is an open-source, multi-platform, cooperative flight simulator development project. Source code for the entire project is available. (OpenGL)[OS Independent]

Clone of the classic game "Paradroid". (C, Python) [MacOS, Windows 95/98/2000, Linux]

A 2D real-time multiplayer tank battling game. (C++) [Windows 9X/2000/XP, Linux]