GIMP - GIMP is a multiplatform photo manipulation tool.
piZap - Free online photo editing software.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
FotoFlexer - FotoFlexer is the most powerful online photo editor in existence.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.