Below a list of Web based graphic editors that work on almost any web browser and under any platform that supports them (Windows, Mac, Linux, etc)

They are all quite decent, but my favorites are:

Splashup, a free and easy to use Flash (10) powerful editing tool and photo manager with an interface similar to Photoshop,.that works in real-time and also allows you to edit many images at once in batch mode.

Splashup integrates seamlessly with top photo-sharing sites.

Features:

  • Multiple image editing
  • Pixel-level control
  • Layers
  • Brushes & Filters
  • Layer effects
  • Integration with top photo-sharing sites like flickr
  • Fullscreen mode
  • Resizable windows and panels

Aviary is a suite of powerful creative applications that you can use right in your web browser, accessible to artists of all genres, from graphic design to audio editing.

Image Editor

Their image editor has layers, masks, effects, undo history, and all that other good stuff. Learn more about Phoenix

Vector Editor

The world's first online vector editor. Learn more about Raven

Image Markup

Use Falcon to quickly capture images and web pages from your browser or desktop and crop, re-size or mark them up. Learn more about Falcon

Swatch Editor

Color swatches and palettes tool that will help you find colors. Learn more about Toucan