Character animation system for games and simulations.
The Atomic Game Engine is a multi-platform 2D and 3D engine
online 4X browser game engine
Modern AS3 Game Engine
3D .NET engine for Windows, Linux, Mac
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Egret is a brand new open mobile game and application engine
2D physics engine for games
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine
The Objective-C Interactive Simulation Abstraction Layer