An advanced flexible game engine for Java.
A generic 2D engine for any kind of game
Open Source 3D Game Engine
A 2D Adventure Game & Engine
TurboSphere is an easy to learn and powerful JS based game engine.
A 3D, fully concurrent game engine
3D game engine for C and C++
A very small multi-platform game engine for creating desktop games.
A truly extensible cross-platform game engine
Open source, moddable game engine for the "Polygon Love 2" game
The Lambda-Engine is a cross platform game engine.