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CamanJS is very easy to extend with new filters and plugins, and it comes with a wide array of image editing functionality, which is only growing as the community makes more plugins. These html5 canvas library has a powerful layering system, much like the one present in Photoshop and GIMP, that makes the sky the limit for your creativity. Using CamanJS is extremely simple, but also very flexible. All of the functionality is accessed by calling the Caman() function.
One very important thing to note: due to browser security restrictions, This html5 canvas library can only modify images that come from the same domain as the page in which it’s loaded unless you specify a proxy.
Download : http://github.com/meltingice/CamanJS
License : No License