ResExcellence  
   This site contains a good supply of customization tricks and hacks, satisfying the more adventurous user who doesn't shy away from ResEdit.
   http://www.resexcellence.com/

Tiger Technologies  
   Control panels that alter window patterns, desktops, and other aspects of appearance.
   http://www.tigertech.com/

Nifty Neato Software  
   This site is the home of Snitch, a control panel that extends the capabilities of the Get Info window. With the use of plugins, one can edit the type and creator codes, alter attribute flags, and view previews.
   http://www.niftyneato.com

Mscape Software  
   Creators of various icon editing utilities, including Iconographer, a fully featured 32-bit icon editor, clip2icns, an easy to use icon insertion tool, clip2cicn, a tool for creating Kaleidoscope schemes, and Glypher, an utility for generating system fold
   http://www.mscape.com/

Silver Dragon Kaleidoscope Styles and Schemes  
   More than 125 color schemes for Macintosh K2 interface control panel, cursors, banner creation, and freeware icons.
   http://members.tripod.com/~SlvrDragon/kaleidoscope.html

One-button mouse  
   Icons, artwork, and desktop pictures, for the Mac.
   http://www.onebuttonmouse.com/

PseudoRoom  
   Digital design beyond the norm: Mac icons, desktop pics, and software.
   http://www.pseudoroom.com/

Mac OS Soundsets by Bruce Dickstein  
   A collection of soundsets he has made.
   http://www.geocities.com/Broadway/9045/soundsets.html

Mac OS Resources  
   System sounds, sound sets, desktop patterns, desktop pictures, and other system enhancments.
   http://www.macosresources.com/

AppleScriptsToGo  
   Automation of tasks. All scripts are created by Marc Meyers of Fairview Park, OH.
   http://www.AppleScriptsToGo.com

IheartNY Design  
   Professional graphic design for Mac OS X icons. Includes free dock skins and icon sets as well as a graphics how-to section and forums.
   http://www.iheartny.com/

Pixilate  
   A site dedicated to the design of typography, icons, and animation.
   http://www.pixilate.com/