Game engine supporting many 3D/2D formats and graphic effects
Arianne is an engine to develop multiplayer online games like Stendhal
Source code of the chapters of the book 3D Game Development with LWJGL
Asphyre is a cross-platform framework for Delphi and FreePascal.
3D .NET engine for Windows, Linux, Mac
Java decentralized cross-platform network multiplayer game engine
Multimedia asset management and manipulator for Étoilé
A generic 2D engine for any kind of game
Java Gamepad API for multiple platforms
Modular Gaming Open Source Persistent Browser Based Game Framework
TurboSphere is an easy to learn and powerful JS based game engine.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
Multi-Language Wrapper Collection for the Irrlicht Engine
AMOS BASIC reimplementation in Java
The next generation mud is an open-source extensible, programmable mud