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.
Photoshop.com - Photoshop.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.