Open source voxel world
Odamex is a free, cross-platform, modern client-server Doom engine
Colonize the New World.
Domination is a game that is a bit like the board game Risk
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
Cooperative multiplayer graphical RPG and adventure game
Arianne is an engine to develop multiplayer online games like Stendhal
Cross-platform real-time strategy game (3D)
Classic arcade game remake of Swing Plus -Total Mindcontrol
Legatus is network playable Renegade Legion
A funny game for a good company similar to karaoke
X3D Prototypes for the SMUOS Component
A Java client for mangband.
Computer-assisted miniature tank game.
OpenQuest is a computer game conversion of the board game HeroQuest.