Thanks for reply,
I already heard a lot about Unity3D, it’s probably the option that I’ll choose(even it’s not open source), I’ll try to use it and see how work.
Cocos3D is availabe olny in cocos2d-iphone(not available to cocos2d-x), and it’s limited to cocos2d-iphone 1.x.
ogre 3d maybe is a good option, I’ll consider if a don’t like Unity3D.
Gameplay is not much popular, I can’t find much documentation about it.