RPG Maker 2000/2003 and EasyRPG games interpreter
Magic Another Game Engine
Multi Theft Auto is a game engine
A simple tool to allow Chessmaster 10/11 bot customizations
Game engine supporting many 3D/2D formats and graphic effects
Full featured MUD server with all the trimmings.
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
C++ Text Adventure Engine
WGFX 2D Game Engine
Point-and-click 2D game engine
A complete 2D Game Engine with built in drag and drop editor
OSGET is the first open source mobile game engine template.
Free MMORPG Engine. Develop and host graphical browser-based games.