GIMP

=GIMP= GIMP is a free graphics and photo editing program offering similar capabilities that you find with photoshop. Some of the capabilities includes photo cropping and resizing photos, creating graphics, altering photo's, creating animated graphics and converting bet between different image formats.

A good overview is available on wikipedia: http://en.wikipedia.org/wiki/GIMP

Image Reference: http://en.wikipedia.org/wiki/GIMP