A chess application : game with human and/or computer
Cross-platform port of Arx Fatalis, a first-person role-playing game
3D world editor for game development
Cross platform 2D game creation framework with Python bindings
A very small multi-platform game engine for creating desktop games.
Tactical, turn-based game engine, that uses OpenGL and WinAPI
SuperWikia: The Runtime/Realtime Environment for Codesmiths
A free open source Android version of Caravan
Open source, moddable game engine for the "Polygon Love 2" game
Gameserver Installer/Startscript for HL1 and HL2 Games
P.C. shooter, driving game
An Open Engine for use on the OUYA
Little game background framework in java.