The Unarchiver - Handles virtually all compressed file formats

Quicksilver- Find it, launch it, or open it - quickly

Growl - One-stop notification center for growl-enabled apps

Sometimes the basic user interface just needs a little help. This assortment augments the built-in apps with faster, more versatile counterparts to help you get more out of your Mac.

Mac Utilities

Burn - Augments the built-in disc burning app with advanced options

Chuck - Super fast, lightweight app launcher