Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
Adobe Photoshop Express - Easily edit and share your photos in no time!
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Pixlr-o-matic - Add retro effects to your photos in a snap!
VSCO Cam - VSCO Cam is an iPhone, iPod Touch, & Android camera app w/ elegant, minimal processing options.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.