LevelHelper

LevelHelper is a level editor for Cocos2d, Cocos2d-X and Corona Lab.
It lets you design big, complex levels with or without physics for your game.

Among the most important features, are the ability to create joints, parallaxes, custom user data, animations, beziers, path movement, cut sprites and associated physical shapes and more.
Since at the core, LevelHelper is a level editor, the most important thing is how you layout the game world. Transformations such as scale, rotation around a specific point or the origin, lasso selection and more are made to be as easy to use as possible.
LevelHelper requires SpriteHelperFree or SpriteHelper, available on the Mac App Store.
For a complete presentation with movies, tutorial, blog post and more, please visit the official website.