For Mac
Name Mangler - batch rename files
OS X menubar items
Reeder
Video Monkey
SpotInside : search for words in your mac
Grand Perspective - graphically shows the disk usage
The Unarchiver
Differences Examiner - compare text files and display their differences.
Photo Grabbr for Flickr (Mac)
Scrivener
Timeline Software
Stellarium (Mac, Windows, Linux)
Droplr - file, image, note sharing
Cinch - mouse-driven window management
ForeverSave - never loose documents again
Word Counter
Cyberduck | FTP for Mac
AppTrap
Transmission - BitTorrent client
Hex Color Picker
SABnzbd+, the Full-Auto Newsreader
MemoryFreer
VirtualBox (run windows on mac)
ResizeIt - change the size of multiple images
Tofu - read on a screen
Blue Crab - download a website