SpriteHelperFree

SpriteHelper is a texture editor, with advance resampling algorithms and multiple image formats, its a physics editor that have support for concave and convex shapes, auto tracing, multiple shapes per sprite and advance collision detection like the ability to figure out via code if you have collided with the head or the torso of a character.

Finally its an animations editor that gives features such as time per frame, user data per frame and via code, notifications like "animation has ended", "animation has completed all repetitions", "animation has reached frame".
SpriteHelper also comes bundled with an API that makes loading a sprite or an animation together with its physical representation a one line of code job.
Support for engines:
Cocos2d
Cocos2d-X
CoronaLabs
Free version does not allow saving animations and physical shapes.
More info and video presentations on
www.spritehelper.org