Desktop/Android/HTML5/iOS Java game development framework
2D game development library for Ruby and C++
Blueshift is a cross-platform 3D game engine implemented in C++
Framework for GPU-accelerated video and image processing
Multi-threaded game engine for Android
Realtime 3D engine for game development
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A cross-platform OpenGL based lightweight scenegraph library