FotoFlexer - FotoFlexer is the most powerful online photo editor in existence.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Photoshop.com - Photoshop.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.
IrfanView - IrfanView ... one of the most popular viewers worldwide.