Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
Orx: Portable Game Engine
Java Settlers
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
An environment to develop games based on a rectangular board
Asphyre is a cross-platform framework for Delphi and FreePascal.
3D .NET engine for Windows, Linux, Mac
A game engine written in the D programming language
Um pequeno framework didático de games em Java
An advanced flexible game engine for Java.
evolution for vegastrike SpaceSim/Combat/Trade game
A generic 2D engine for any kind of game