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
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
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
Free Android 2D OpenGL Game Engine
A multiplatform game engine for interactive fiction experiences
Role Playing Game Engine
UtiliGame is a light-weight game engine written in Java.
A game engine in java for 2D strategy games
Free MMORPG Engine. Develop and host graphical browser-based games.
Gomoku Game: Playing with Computer