You can make it - Open Source MMORPG Platform
Fast and lightweight JavaScript game engine built on WebGL and glTF
Gideros Release version
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A cross platform Lua based game engine
A real-time game development platform
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac
Educational framework for OpenGLES, OpenCL and OpenAL
A generic 2D engine for any kind of game
3D Interactive sandbox environment
Pear3DEngine is a modern and modular 3D development framework
AS3 Utilities library (Games Development Framework)
A cross-platform OpenGL based lightweight scenegraph library
A cross platform 3d c++ game engine
The Lambda-Engine is a cross platform game engine.
Make games with Lego-like building blocks
MOVED: http://github.com/wilkystyle/java2dphysicsengine
A small Game Engine project.