Odamex is a free, cross-platform, modern client-server Doom engine
Air traffic control tower and radar simulator (solo + multi-player)
Cross-platform real-time strategy game (3D)
Ur-Quan Masters High Definition
X3D Prototypes for the SMUOS Component
OpenKore is an automation tool for Ragnarok Online
A Multiplayer Bao (Bawo) App for GNU
Simple meta-server for locating other multiplayer servers
The All-in-One music game
Library for creating turn-based games with simultaneous moves.
Proxy for games that emulates network conditions like ping and lag.
Tactically-oriented first person shooter, heavily WIP