Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
piZap - Free online photo editing software.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Photoshop.com - Photoshop.