Desktop/Android/HTML5/iOS Java game development framework
Orx: Portable Game Engine
2D Game Engine
Cross-platform 2D and 3D game engine
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
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine
Delphi-like IDE for cross-platform game development
The Objective-C Interactive Simulation Abstraction Layer