RPG Maker 2000/2003 and EasyRPG games interpreter
Desktop/Android/HTML5/iOS Java game development framework
The source code to VVVVVV
Domination is a game that is a bit like the board game Risk
3D modeler, 3D game maker, 3D demo maker
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Game engine supporting many 3D/2D formats and graphic effects
Classic arcade game remake of Swing Plus -Total Mindcontrol
Blind Chess using Taiwan rule
Web-based Cloud Gaming service for Retro Game
games for kids
Space shooter style game arcade version - Games/Entertainment Software
A question-answer game for various trivia topics for road-trips
Cross platform Game Creation Software
Kids Games in Flash
Flickit is fun 2d physics arcade style game.
Nurikabe, a great game.
Cross-platform 2D game engine
OSGET is the first open source mobile game engine template.