Have you tried to google this at all? There's even a tools list on the cocos2d-x page: http://www.cocos2d-x.org/hub/all?category=4
– CodeSmileMay 27 '14 at 11:58
You can use CocosBuilder (although a bit dated) and there is also CocosStudio: http://www.cocos2d-x.org/wiki/Cocos2d-x
– GameDeveloperMay 27 '14 at 13:56