OmniDiskSweeper is a Mac OS X utility for quickly finding and deleting big, useless files and making space on your hard disks. OmniDiskSweeper scans your disks and highlights the biggest files, so you can determine what's using up your disk space. It's a fast, easy way to find things that are hogging your drive and clear them out so you've got room for the stuff you really need.
View your files
When you start OmniDiskSweeper, it presents you with a list of disks attached to your machine. Double-click on one, and a new window opens with a column view listing every folder and file you can access, which it sorts by size as you watch.
The free space on the disk and the ordering of the folders are automatically recalculated as you delete the old, space-hogging stuff you don't need anymore.
Smarter than Finder
Sure, you could do this with the Finder, but OmniDiskSweeper makes it easier. Since the directories and files are sorted by size, you get to quickly zoom in on the big files that are taking up all the space—and not worry about the thousands of tiny ones that aren't hurting anyone.