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GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.

http://www.gimpusers.com/

A binary distribution of the GNU Image Manipulation Program for Mac OS X.

Paint.NET is image and photo manipulation software designed to be used on computers that run Windows 2000, XP, or Server 2003.

Image Compressor PowerPack: eBay Tools is an add-on for Image Compressor to optimize your images before uploading to eBay. This PowerPack will create all eBay compatible image sizes, including: Standard size copies: 400, 200, 96 pixels on the longest sid; Supersize copy: 800 pixels on the longest side. A picture is worth a thousand words. This is a tool to improve your pictures and sell your goods at a much better price on eBay.

FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor. It has a nice array of features that include image viewing, management, comparison, red-eye removal, emailing, resizing, cropping and color adjustments.