Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
miniPaint - Online graphics editing tool use HTML5 technologies like Canvas, Offline support, Drag and Drop.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
Paint XP for Windows 7 - Standalone old MS Paint program that allows you to get your old XP Paint interface in Windows 7.