A dead simple 2D game library for Go
A lightweight online game framework
A free engine for C&C Tiberian Dawn
SJCE - free portable cross-platform graphical chess game, 100% Java.
a race scenario drawing tool
Chess application whichs allows working with chess PDF books and PGNs.
Enigma is a puzzle game
Game engine supporting many 3D/2D formats and graphic effects
Open source revival of the game Transarctica / Arctic Baron
Tongue-in-cheek action RPG