OS X Man Pages
OS X Shell scripting primer - Mac OSX Reference Library
Unix03 Conformance - Mac OSX Reference Library
Apple Support - Knowledge Base
Developer.Apple.com - OS X Documentation
Apple Developer Connection - OS X Documentation
Apple Support Downloads - Patches, Security updates, New and old versions of Apple software
Tips and Tricks for Mac Management (White Paper PDF)
Apple Support Manuals
Customer Installable Parts (DIY) - Apple Support
iPhone Enterprise - Security/Deployment utility
Darwin Project - Open Source at Apple
Apple Corp. Discussion
AppleID - AppleCare login
AppleCare registration (also buy AppleCare at eBay)
Learning the Mac OS X Terminal - Chris Stone (O'Reilly, 2001)
Unix FAQ for OSX - via the MacOSXHints forum
ifixit.com - Repair guides for Mac
MacOSXhints - Hints & Tips, Q&A
MacEnterprise - Login scripts, Active directory deployment
MacDevCenter.com - Technical Tips
MacRumors - Release Dates
OS X FAQ - Unix Tutorials
manpagez - Man Pages from Huntsville Mac Users Group
Man Open - A GUI to find and open man pages
Apple.slashdot.org - News and Gossip
Hayne of Tintagel - OSX FAQ and useful Bash scripts
Apple Manuals
MacFixit - Troubleshooting for the Mac
Migration Assistant - transfer files from another Mac
Colour Picker - How to use the Mac colour picker
Xcode Developer Tools package - programming tools and utilities for Mac, iPhone, and iPad.
OSX: The Missing Manual, Snow Leopard Edition
by David Pogue
The "must have" guide for all Mac OS X users
Learning the bash Shell (O'Reilly 3rd edition)
by Cameron Newham
Bash shell programming, flow control structures, job control.
Mac OS X for Unix Geeks
by Brian Jepson, Ernest E. Rothman
The book to buy if you already know UNIX, Sept 2008
Mac OS X Tiger in a Nutshell
A command-line centric book aimed at the advanced to expert user who wants to dig into the underpinnings of Unix.
Mac OS X Snow Leopard Pocket Guide
by Chris Seibold
A small and affordable reference bookAppleScript : The Definitive Guide by Matt Neuburg
An in-depth guide to AppleScript, 2nd Edition 2006
Server Admin Tools 10.7 (Lion) - Remote administration tools, documentation, and utilities
Server Admin Tools 10.6 (Snow Leopard) - Remote administration tools, documentation, and utilities
Server Admin Tools 10.5.5 (Leopard) - Remote administration tools, documentation, and utilities
To use the Server Admin Workgroup Manager with a local computer instead of a server, enter the loopback address "127.0.0.1" in the Server address field and authenticate with your local Administrator username/password.
Apple Remote Desktop - Screen sharing plus remote install (Software Distribution).AbiWord - Word Processor
AcquisitionX - Filesharing client
Amadeus Pro - Sound editor
Angry IP scanner - network scanner for network administrators
AppCleaner- Delete application/preference pane files
ApcUPSd - UPS control software
AppleJack - Troubleshooting assistant for OS X (single user mode)
ArtRage - Paint tool for kids
Ardour.org - Record Multi-track digital audio
AudioHijack - Capture streaming audioBatch RenameEm - Rename files
BBEdit - Text Editor
BitCom FreeSee - Browse & preview pics and graphics
Blender - 3D graphics
Burn - Burn CDs & DVD's
SimpleBurns - Burn CDs & DVD's
CarbonCopyCloner - Clone/backup hard drive
Caffeine - Prevent your Mac from automatically going to sleep
Chmox - Read CHM Help documents (sourceforge)
ClickToFlash - Flash block for Safari
CocoaDialog - GUI controls from the command-line
CocoViewX - Image browser
Cyberduck - FTP
Deeper - Modify hidden functions of Finder, Dock and more
DigiDNA - Copy files without using iTunes
Disk Inventory X - Graphical disk usage utility
DiskWarrior - Disk Repair
DoubleCommand - Remap keys to change the way the keyboard works
MyDVDedit - modify the content of a DVD
ExpanDrive - Open, edit, and save files to remote computers
Fink - Open Source Games, Audio, Crypto and more
Flip4Mac - Play Windows Media + Silverlight (choose install | customize to deselect)
Fluke - Play FLACs in iTunes
Gallery - Photo Album website (php)
Gimp - GNU Image Manipulation Program
Google command line - Script Youtube, Calendar, docs, picasa etc
Graphic Converter - graphics conversion and basic image editing
Handbrake - DVD Ripper
Inkscape - Vector Graphics (Illustrator)
iPhoto Buddy - Use more than one Library with iPhoto
iPod Reset Utility - for Shuffle
iStat Menus - System Monitor
iTerm2 - Terminal with Search and Replay
iTunes LAME encoder
iTunes Alarm - Alarm clock
iWork - Wordprocessor and Spreadsheet from Apple
KeyCodes - Display code for each keyboard key.
LiteIcon - Change OS X finder icons
Little snitch - prevent applications 'dialling home'
Klieme - Time Machine Scheduler, eyesight
Mac the Ripper - DVD Ripper
Max - Rip CD's in Maximum quality & convert audio file formats
Menu Meters - CPU, memory, disk & Network activity
muCommander - File manager with a dual-pane interface
Open Office for Mac - MS Office compatible Word Processor/Spreadsheet
OpenProj - Free, open source project management, (replacement for MS Project)
OmniGroup - Drawing/Diagrams, Dictionary, Outliner (note taking), Project Management
OnyX - Maintain and optimize OS XPaintbrush for OSX - Bitmap graphics
Pacifist - Open pkg /dmg files e.g. OS X install disks and extract files
Panic Transmit FTP (also see Cyberduck, Fugu, PureFTPd)
Parallels.com - Run win 32 programs in parallel with OS X apps
Pashua - Aqua dialog windows for your scripts
PictureCode - Noise Reduction
Pixelmator - Image editor (like PhotoShop but cheaper and easier to use)
Platypus - Convert a script into a full MacOS X application
PGP for Mac - Mac GNU Privacy Guard
Quicksilver - App/document launcher
Reggy - Regular Expression tester/viewer
Renamer.com - Shareware file renamer
RipIt - DVD Ripping, even movies that trip up HandBrake or MacTheRipper
rsyncX - File copy & Synchronize
RCDefaultApp - Set file associations
Sequel Pro - Web development (MySQL)
ScreenGrabber - Convert movie to stills
ScriptGUI - Run shell scripts from the finder
Scrivener - Writers studio (Outliner)
ShellHere - Open a terminal window in the current Finder window
ShinyWhiteBox - Video capture (record Window/Desktop)
SMARTReporter - HD monitor
Smultron - Text editor with code highlighting
SoundStream - Screensaver
Squared5 - MPEG Streamclip video converter
Startly - QuickKeys Macros
StartupSound - Adjust volume of the boot chime
SuperDuper - Disk cloner, create a bootable recovery disk
TextWrangler - Text Editor
TenderApp - Helpdesk
TimeMachineEditor - change the default one-hour backup interval of Time Machine.
TinkerTool - User interface tinkering
Trance - Change CR/LF, TextForge Text Editor
Transmit - The best FTP client
Ukelele - Keyboard Layout Editor
UnArchiver - Replacement ZIP archive unpacker (BOMArchiveHelper)
Unpkg - Tailor installation packages to allow manual install
UnSanity - Custom mouse cursors
Vienna - RSS reader
Vim for Mac - Classic text editor
VNC - vine viewer or Chicken of the VNC - Control a remote Mac/PC
VLC Audio/Video Player - MP3, wma, DVD, Flac etc
Video Codecs - Handy list from the University of Berlin
VMWare Fusion - Run Wintel & Mac apps side-by-side (Amazon link )
Windows Media Player & QuickTime components
World Clock - Screensaver
WriteRoom - Shareware text editor
Xee - Image viewer (Preview replacement)
YASU - Yet Another System UtilityFind more apps at MacUpdate.com or iusethis
SS64 Discussion Forums
The most common format of music on an iPod is 'stolen' - Steve Ballmer