fiftyfifty is a programming language and game
Cross-platform 2D gaming middleware
Simple opensource crossplatform openGL&GLext
A lame multi-user dungeon engine.
Free MMORPG Engine. Develop and host graphical browser-based games.
Basic real-time simulation engine in C++
Experimental raycasting engine
Classic Doom Frontend
MKEngine is a game engine for Text-Based games.
Gomoku Game: Playing with Computer