This is a free to use online image editor with a fair amount of features. I use this primarily for quick editing jobs such as resizing and cropping small images. The online editor will load images from your computer or via url which is incredibly handy. There is a firefox plug-in available too which makes the time it takes to view an image, edit, and save it, a fast process. The source code for the application is closed, but the dev team does offer a free API. Pixlr also has tools for mobile devices, one of which is paid app for $1.