Online Image Editors

Gimp is a free, open source image editing and compositing tool that has many of the layering and filtering abilities of Photoshop.

Aviary’s Phoenix is another great free tool that is entirely web based. You can edit and layer images in a Photoshop-like environment right in your web browser, then save the finished product to your desktop.

Photoshop.com also offers a free, “lite,” web-based version of the popular editor.