Cocos2d-x
Open Source Cross-Platform Game Development Framework
Cocos2d-x is a mature open source cross-platform game development framework that supports 2D and 3D game creation. The engine provides rich functions such as graphics rendering, GUI, audio, network, physics, user input, etc., and is widely used in game development and interactive application construction. Its core is written in C++ and supports development in C++, Lua or JavaScript. Cocos2d-x deploys to iOS, Android, HTML5, Windows and Mac systems with features focused on native mobile platforms.
Навскидку - obsidian.