Pixlr
Pixlr is a free online image editor, jump in and start edit, adjust, filter. It’s just what you imagine! Uploading the picture you want to edit is really easy, and it shouldn’t take you more than a couple of seconds. The site has everything people are looking for on a site: it’s simple and useful. Once you get the hang of this, you’ll never go back to Paint. It’s like Photoshop Express, but easier to use.
Splashup
Splashup, formerly Fauxto, is a powerful editing tool and photo manager. With all 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 photosharing sites, and even has its own file format so you can save your work in progress.
SUMO Paint
SUMO Paint is a free image editing software that gives you the opportunity to create, edit and comment images online with powerful tools and layer support.
Others Editors
http://www.cellsea.com/media/index.htm
http://www.onlinephototool.com/
http://www.phixr.com/
http://www.picture2life.com/
http://www.pixer.us/
http://www.preloadr.com/
http://pixenate.com/
http://snipshot.com/
http://www.webresizer.com/
http://www.webpictool.com/