DaisyDisk is an OS X app that displays your Mac's drive storage as an interactive visual diagram. It helps users easily see how their drive space is being used, allowing for quick identification and removal of large, space-hogging items. While normally US$10, the app is on sale in the Mac App Store for $5 until February 7th.
Check It Out: Use DaisyDisk to Clean Up Your Mac Drive, 50% Off Until Feb. 7