scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Animation Compression Library
A pure Go game engine
SDL based generic 2D game engine
QQ Group:538722494,KSFramework = KEngine + SLua(or xLua)
RTSish Game Engine
Low-Level Game Engine for Retro Platforms
scriptable game engine with built-in support for 2D graphics and sound
2d/3d Game Engine
Egret is a brand new open mobile game and application engine
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
XNA based game engine completely written in c#
a flexible game engine
The Lambda-Engine is a cross platform game engine.
Cross-platform 2D gaming middleware