RPG Maker 2000/2003 and EasyRPG games interpreter
Magic Another Game Engine
Game engine supporting many 3D/2D formats and graphic effects
A free 3D game engine to create games and realtimes scenes for Windows
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
An online multiplayer turn based strategy game and board game engine.
Built to be ease of use, with no programming knowledge, Multi-platform
A complete 2D Game Engine with built in drag and drop editor
Free MMORPG Engine. Develop and host graphical browser-based games.