Game engine supporting many 3D/2D formats and graphic effects
Orx: Data-Driven Game Engine
Arianne is an engine to develop multiplayer online games like Stendhal
The imaginary eight-bit machine
A cross platform Lua based game engine
8-bit Graphical API for Java
Portable game engine with main focus on point-and-click adventures
Build Cross-platform Applications
3D .NET engine for Windows, Linux, Mac
A game engine written in the D programming language
An advanced flexible game engine for Java.
Java decentralized cross-platform network multiplayer game engine
A generic 2D engine for any kind of game
Take the chess graphism, and use it with a chess engine.
A multiplatform game engine for interactive fiction experiences
An open source skateboard games engine written in C# and .NET.
Pear3DEngine is a modern and modular 3D development framework
An extensible development framework for roleplay games.
A game engine in java for 2D strategy games
The classic intelligent role playing game
AMOS BASIC reimplementation in Java