Cocos2D-x

Cocos2D-x is free game engine with full source code.
Official Website : http://www.cocos2d-x.org/
Download : http://www.cocos2d-x.org/download

Features :

1.Cross Platfrom
-Applies C++, Javascript, and Lua to iOS, Android, Windows Phone, BlackBerry,Tizen etc.

-Works on any html5 ready browsers

-Works on all mobile web browsers

2.Open Source

3.Scripting Support

-Supports C++, LUA and Javascript

-Run your Javascript on HTML5 enable web browsers

-No drama; plug and play

  

4.Editor Support

-Supports a wide range of the existing third party editors

-Professional Cocos2d editors CocoStudio and CocosBuilder are available

5. And much more..