Linked Resources for Mac Users

Apple
  http://www.apple.com
  http://www.apple.com/support/icloud/systemstatus/

Apple AntiVirus (Recommended)
  http://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-mac-home-edition.aspx
  http://arstechnica.com/apple/2012/05/hands-on-with-five-antivirus-apps-for-the-mac/

App Cleaner
  http://www.freemacsoft.net/appcleaner/

App Compatability Table
  http://roaringapps.com/apps:table (Lion)
  http://snowleopard.wikidot.com/ (Snow Leopard)
  http://www.macupdate.com

AppleJack
  http://sourceforge.net/projects/applejack/

Apple ID
  http://www.apple.com/support/appleid/

AppleScript
  http://manuals.info.apple.com/en_US/AppleScriptLanguageGuide.pdf
  https://developer.apple.com/library/mac/#documentation/applescript/conceptual/applescriptx/Concepts/work_with_as.html
  http://www.google.com/search?q=applescript+tutorial
  http://www.macinstruct.com/search/node/applescript

Apple Security
  http://www.apple.com/support/security/guides/ (Recommended)
  http://www.apple.com/support/security/
  http://www.apple.com/macosx/security/
  http://www.nsa.gov/ia/_files/factsheets/macosx_10_6_hardeningtips.pdf
  http://www.macshadows.com/kb/index.php?title=Hardening_Mac_OS_X
  http://www.securemac.com/ (Mac OS X Security)

Apple Security Updates
  http://support.apple.com/kb/HT1222

  http://validator.w3.org/ (checks the markup validity of documents in HTML, etc.)

Apple Manuals
  http://support.apple.com/manuals

AppleNews (check daily)

Apple Software & Support, etc.
  http://www.apple.com/contact/
  https://supportprofile.apple.com/
  http://developer.apple.com/opensource/tools/  
  http://support.apple.com/kb/HT1343 (Boot Options)
  http://support.apple.com/manuals
  http://www.apple.com/downloads/
  http://www.apple.com/macosx/security/
  http://www.apple.com/sitemap/
  http://www.apple.com/support/
  http://www.apple.com/support/appleid/
  http://www.apple.com/support/downloads/
  http://www.apple.com/support/find/
  http://www.apple.com/support/manuals/

Apple Support from third party sources
  http://www.ifixit.com/
  http://www.macinstruct.com/

Audacity for Mac
  http://audacity.sourceforge.net/download/mac

Check for Plugin Updates (Very Important)
  https://browsercheck.qualys.com/ (Best)
  http://krebsonsecurity.com/2013/03/help-keep-threats-at-bay-with-click-to-play/

Command Line Commands & Resources
  Type in Terminal "man"
  Type in Terminal "sw_vers"
  Type in Terminal "system_profiler"
  http://ss64.com/osx/
  http://apple.stackexchange.com/questions/5435/terminal-tips-and-tricks-for-mac-os-x
  http://www.leftcolumn.net/2009/02/15/40-useful-mac-os-x-shell-scripts-and-terminal-commands/
  https://github.com/mathiasbynens/dotfiles/blob/master/.osx
  http://www.commandlinefu.com

DiskWarrior, etc.
  http://www.alsoft.com/DiskWarrior/
  http://reviews.cnet.com/8301-13727_7-10422139-263.html?tag=mncol;title

Fax Documents (online)
  http://faxzero.com/

GIMP (Open Source similar to PhotoShop®)
  http://gimp.org/
  http://osxdaily.com/2012/08/28/gimp-free-photoshop-alternative-mac-os-x/

Iowa State Mac OS X Issues
  http://tech.its.iastate.edu/macosx/macosx-10.6.shtml
  http://tech.its.iastate.edu/macosx/macosx-10.7.shtml
  http://tech.its.iastate.edu/macosx/os-x-10.8.issues.shtml

iPad/iPhone/iPod Apps (Reviews)
  http://www.appstoreapps.com/most-popular-apps/

Java (Disable)
  http://www.macworld.com/article/2028900/how-to-disable-java-on-your-mac.html

Keyboard and Character Viewer (turn on in System Preferences)
  Keyboard and Character Viewer

LibreOffice (alternative Open-source Office Suite)
  http://www.libreoffice.org/  LibreOffice
  http://www.libreoffice.org/get-help/documentation/

Little Snitch (Outbound Firewall)
  http://www.obdev.at/products/littlesnitch/index.html

  In a nutshell, an "outbound firewall" monitors all the traffic and
  requests leaving your computer, allowing you to ensure that nothing
  malicious is happening and that no sensitive data is being sent
  without your approval.

Mac Ads
  http://www.adweek.com/adfreak/apples-get-mac-complete-campaign-130552
  http://movies.apple.com/ca/getamac/ads/
  http://en.wikipedia.org/wiki/Get_a_Mac
  http://pastie.org/602001.txt
  http://adweek.blogs.com/adfreak/get-a-mac-the-complete-campaign.html

Mac Confguration Tips
  http://spider.ipac.caltech.edu/staff/hoard/pages/MacOSX_configuration_tips.html

Mac Maintanence
  http://osxdaily.com/2012/03/04/mac-maintenance-tips/

Mac Manuals
  http://support.apple.com/manuals/ 
  http://support.apple.com/manuals/#macos 

Mac Software
  http://www.apple.com/downloads/macosx/
  http://www.macupdate.com/
  http://www.pure-mac.com/

MacUpdate
  http://www.macupdate.com/
  http://www.macupdate.com/about/

Mozilla Firefox and Thunderbird (alternative brower and alternative mail client)
  http://www.mozilla.org/products/

OpenOffice (alternative Open-source Office Suite)
  http://www.openoffice.org/  OpenOffice
  http://www.openoffice.org/support/

Open-source DNS Benchmark Utility (Recommended)
  http://code.google.com/p/namebench/

Parallels (virtualization software - multiple operating systems, if you must)
  http://www.parallels.com/en/

Ramjet (Mac Memory)
  http://www.ramjet.com/
  http://ramjet.com/imacflat.asp

Reset NVRAM and PRAM
  http://support.apple.com/kb/HT1379

Should I Change My Password
  https://shouldichangemypassword.com/

Simple Help
  http://www.simplehelp.net/

Snow Leopard
  Sticking with Snow Leopard

Software Conpatibility with Lion and Mountain Lion
  http://roaringapps.com/apps:table

Software Sources
  http://code.google.com/p/rudix/downloads/list
  http://www.macupdate.com/

Speeding up your Mac
  http://www.macworld.com/article/1156418/speedier_mac.html

System Requirements
  http://www.apple.com/macosx/specs.html for Mountain Lion (OS X 10.8)
  http://support.apple.com/kb/SP629 for Lion (OS X 10.7)
  http://support.apple.com/kb/SP575 for Snow Leopard (OS X 10.6)
  http://support.apple.com/kb/HT3759 for Leopard (OS X 10.5)
  http://support.apple.com/kb/SP517 for Leopard (OS X 10.5)

Text (send text messages online)
  http://www.textem.net/index.php

TNEF's Enough (extracting contents of winmail.dat attachments)
  http://joshjacob.com/mac-development/tnef.php

Unix Tools (DMGs, Pkgs, etc.)
  https://developer.apple.com/library/mac/#releasenotes/Darwin/RN-Unix03Conformance/
  https://developer.apple.com/library/mac/#documentation/Porting/Conceptual/PortingUnix/intro/intro.html
  http://manuals.info.apple.com/en_US/Command_Line_Admin_v10.5.pdf
  http://www.macports.org/
  http://guide.macports.org/
  http://xquartz.macosforge.org/trac/wiki/X112.3.1
  http://www.macupdate.com/info.php/id/26593/xquartz
  http://www.shelldorado.com/shelltips/
  http://opensource.apple.com

Video (and Audio) Tools
  Windows Media® Components for QuickTime: Flip4Mac
  VLC media player for Mac OS X
  Audacity for Mac
  http://clipgrab.de/en (Grabbing Video)
  http://osxdaily.com/2006/11/28/instant-handbrake-a-quick-and-easy-dvd-to-ipod-conversion-utility/ (DVD to Mac/iPod conversion utility)

XV is a powerful image viewer/editor widely used in the Unix world
  http://homepage.mac.com/eric.lee/xv/