Some free some not apple mac software/utils, those I’ve paid for were worth it in my opinion:
STUFFIT Expender for Mac Zip/Archive (also for pc STUFFIT Expender for Win)
CSSEdit
Colloquy – IRC client
TextExpander (system-wide text macros)
ExpanDrive (make remote machines local ones)
SizeUp (great window manipulation)
Zooom2 (even greater window manipulation)
Caffeine (prevents sleep mode)
MenuPrefs (quick access to System Prefs)
1Password (easy way to save passwords)
Adium (IM client for multiple platforms)
djay (music mixing)
Flip4Mac (Windows Media add-on)
Handbrake (ripping cds)
Hear (detailed sound output manipulation)
Integrity (site crawler)
iReadFast (interesting little Italian app for reading 1 word at a time)
iStat Menus (good menus for system data — cpu, network, temperature, etc)
NetNewsWire (rss reader)
SizzlingKeys (operate iTunes without going to it)
Sequel Pro (manipulate remote databases)
TextMate (text editor with many bundles for various purposes/languages)
TextWrangler (free robust text editor)
Transmit (the best ftp client)
Transmission (the best bittorrent client)
TweetDeck (go nuts with Twitter)
VLC (most versatile if not the prettiest media player)
Warp (extends Spaces (try Spaces))
Yojimbo (mind dump)
Ciao,