A dead simple 2D game engine for Go
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
Full featured MUD server with all the trimmings.
Portable game engine with main focus on point-and-click adventures
A 3D game engine in java.
An advanced flexible game engine for Java.
An online multiplayer turn based strategy game and board game engine.
Java decentralized cross-platform network multiplayer game engine
Built to be ease of use, with no programming knowledge, Multi-platform
Free Android 2D OpenGL Game Engine
A multiplatform game engine for interactive fiction experiences
Role Playing Game Engine
Little game background framework in java.
UtiliGame is a light-weight game engine written in Java.
A game engine in java for 2D strategy games