Point-and-click 2D game engine
RPG Games without coding!
A 3D multiplayer RPG based in the world of Khoras.
Game engine supporting many 3D/2D formats and graphic effects
Reference implementation for the Doom game engine.
A DirectX based graphics/physics engine
Opensource serious game engine for multiplayer games
The Lambda-Engine is a cross platform game engine.
Gomoku Game: Playing with Computer