Bulk Resize Photos - Resize large photos in bulk
Doka.Photo - Edit images without leaving your browser
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
ProductShot - Generate better performing product screenshots
GIF Resizer - Create animated GIFs and resize GIFs too big to tweet!
Sumo Paint - Photoshop in your browser, Sumo Paint an advanced browser-based image editor.