Splashup, formerly Fauxto, is a powerful editing tool and photo manager. With the features professionals use and novices want, it's easy to use, works in real-time and allows you to edit many images at once. Splashup runs in all browsers, integrates seamlessly with top photo-sharing sites, and even has its own file format so you can save your work in progress.

There are full and lite versions. Both Free. Because the system is web based it works cross platform and has similiar functionality to paint.NET however not as much. A really good feature about splashup is the ability to capture straight from your webcam.