http://www.cocos2d-x.org/
Cocos2d-x is an
open source
game engine under MIT license. It’s fast, easy to use and loaded with powerful features for game development. Cocos2d-x’s key advantage is that it allows developers to
exploit their existing C++,
Lua and Javascript knowledge for cross-platform deployment into iOS, Android, Windows Phone, BlackBerry, Tizen, etc.,
saving time, effort and cost.