Pixlr

Pixlr
Autodesk's Pixlr Editor does a great job of mimicking Photoshop—entirely in the web browser. Pixlr is a full ecosystem of apps, with different versions (like Editor and Express) suited to different needs. Or try the Pixlr-o-Matic Web- and mobile apps for simple, quick changes when you're in a hurry

Homepage: http://pixlr.com