FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Priime - Edit photos with the styles of the world's top photographers. Smart suggestions, fast editing, and inspiring collections.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Filters for iPhone - Transform your photos. 800+ filters and effects. Just 99¢.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Dubble - Take a picture and randomly mix it with anyone in the world