Sumo Paint is an online photo editor containing most of the options Adobe Photo shop has and is free to use. Right from adding layers to different types of brushes, everything is availble.It also includes Filters and allows you to download the images finally into the local drive. Here is the complete list

• The Shape Tools
• Ink Brushes and Default ones
• Filters and Gradient tool
• Gravity, Shape tool, zooming
• Swatches, Color Picker and more which you can read on the site itsef.

Here are some snapshots which you would like to peek into

Sump paint Advanced Good editor

Menu Bar 1 Sumo Paint

Menu Bar 2 Sumo Paint

Tool Kit for Sumo Paint

You can either register with them and keep all your images on ther server and edit it on the move or just download upload from your computer and do you editing work. They also have ranking system for the the uploaded and shared images by the community of Sumo Paint. This makes it fun loving place over all. Give Sumo Paint a try.