GemRB is a portable open-source implementation of the Infinity Engine
A cross-platform port of Hexen II game.
An open-source Phantasy Star Online server for *nix
Computer opponent for the board game Blokus.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Volume 2 of ChaosEsque Anthology
3D driving simulation based on Open Dynamics Engine
A traditional top-down OpenGL car racing game
Cross-platform port of Arx Fatalis, a first-person role-playing game
Game engine supporting many 3D/2D formats and graphic effects
A powerful cross-platform and open-source 3-D rendering engine.