Free
Dropbox Encore
Efficient File Management with Dropbox Encore
Your download will start automatically. If it doesn't, restart it.
Visually evaluate the quality of your WiFi signal
User friendly troubleshooting assistant for Mac OS X
Excellent contextual menu add-on for Finder
Repair disk permissions
Free instant messaging supports most protocols
DVD to QuickTime conversion
Witch: Efficient Window Management for Mac
A free program for Mac, by mac-data-recovery.
Quick access to the apps you use most
LiquidCD: Free Utility Software for Mac
Monitor your Mac's performance in real time
Pause iTunes when you pull out your headphones