Freeware:
TimeMachineScheduler make your backup easier ones a day
TimeMachineEditor lets you change the default one-hour backup interval of Time Machine
AppCleaner allows you to uninstall your apps more easily
Audacity Audio recording, editing and mixing tool
Memory Clean is the ultimate app for optimizing your Mac's memory
LanScan is a free, simple and effective Mac OS X network scanner
Mactracker provides detailed information on every Macintosh computer ever made
Monolingual is a program for removing unnecessary language resources from OS X
Textwrangler is the powerful text editor, and Unix and server administrator's tool
Adapter is a free image, audio and video converter for Mac
Dr. Cleaner can deeply clean your Mac's disk and memory to make it faster
DiskMaker X is an application that you can use to build a bootable drive from OS X
Perian get QuickTime to accept all audio/video formats
HandBrake ripp your DVD’s to iTunes and iPhone format
Cyberduck FTP for Mac OS X
StuffIt Expander free file expansion
Flip4Mac components for QuickTime
Alarm Clock menu item alarm clock
Burn easily burn data, audio, video disks and more
Firefox popular Web browser
VLC media player
coconutBattery see your battery status
Skype free internet calls and great value calls
Thunderbird email application
FileZilla the free FTP solution
Transmission a fast, easy, and free BitTorrent client
TeamViewer establishes connections to any Mac all around the world
Onyx is a multifunction utility for Mac OS X
iExplorer free iPod, iPhone Music Transfer Software
Get Tube is a tool for downloading video or audio from the You Tube site
MacTubes is a YouTube video player and downloader
Plex bridges the gap between your Mac and your home theater
X Lossless Decoder(XLD) is a tool for Mac OS X that is able to decode/convert/play various 'lossless' audio files
WebGrabber is a utility that you can use to mirror, copy, synchronize, download, scrub or "steal" a web site
Photomatrix is an excellent tool for creating high dynamic range photographs

App Store:
Freespace is a tiny menubar utility that can show you how much space is available on all local, connected, and network drives with a single click.
iNet provides you with information about networks your Mac is connected to

Shareware:
Airfoil allows you to send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync
SuperDuper is an advanced, yet easy to use disk copying program
Acorn is a new image editor built with one goal in mind - simplicity
Transmit is an excellent FTP, SFTP, S3 and iDisk/WebDAV client that allows you to upload, download, and delete files over the internet
Awaken turns your Mac into the ultimate alarm clock and sleep timer
Funtastic Photos is a "non-permanent and easily reversible" photo editor
NeoOffice Home is a fully-featured set of office applications for Mac OS X

Commercial:

RapidWeaver is a next-generation web design application to help you easily create professional looking web sites in minutes
iStumbler is the leading wireless discovery tool for OS X
Data Rescue Powerful hard drive data recovery software
Whatsize Find out what files are taking up all your HD space
ClamXav is a virus checker for OS X
Parallels gives Mac users the ability to run Windows and their critical applications at the same time as Mac OS X
Office for Mac be on the same page with Office for Mac and Office for Windows