• Apple Apps
  Address Book, iCal, iChat AV, iTunes, iLife (iPhoto, iMovie, and iDVD), iWork (Keynote, and Pages), Mail, Photo Booth, Preview, Safari, Terminal, X11...
   
• 3rd Party Apps (all free)
  Cyberduck (a FTP Client), lftp (a powerful command-line ftp client),  DjVu (a djvu e-book reader), Firefox, Fun Input Toy (a free Chinese input method), Gizmo (a VoIP client), Google Earth, Fink, iPhoto Library Manager, LaTeXiT, Microsoft Messenger, MPlayer OSX, RealPlayer, Skype (a VoIP client), Vim...