Free stock icons, organized by category. Accepts submissions.

Some free, some fee icons, for Windows and Mac. Includes cartoons, sports, animals and system.

Offers icon design services, for both web and software applications.

Some free ware icons as well as examples of custom work by Sebastiaan de With. Contains an overview of design services that includes interface design, and application and toolbar icons.

A collection of icons that were originally created for the Amiga, converted for Windows, Mac, BeOS, and Atari.

Icons and desktop pictures for Mac OS X and Windows XP and Vista. Some are free, most fee. Custom design services available.

Several large sets of coordinated icons, available for use free of charge under a Creative Commons Attribution license.

Large offering of icons for Windows, Mac and Linux, from many authors.

Free icons distributed from an icon shop. For Macintosh, Linux, and Windows.

Stock icon sets ready for use. Features FAQ and a blog.