WhatSize quickly measures the size of your hard drive and allows you to sort, filter, and refine the results. The files and folders are automatically sorted by size with the biggest sizes first. The application will cache measurements for speed and will use Apple's FSEvents to merge file system changes live.
A visual display of the contents of your hard drive that enables you to drill-down and discover how your disk space is being used.
Intelligent tools allow you to remove IN ONE CLICK log files, download files, cache files, temporary files, nib files, localization files. Files you do not need or Files the app developers forgot to remove. So you can reclaim disk space and speed up your mac.
Identifies duplicate files on your system so that you can move them to trash, replace them with hardlinks or simply delete them immediately. Filter by size so you can deal with just the largest files first. Smart caching and FSEvent support allows real time updates of the duplicates. You would be surprised at how many useless files might be laying around on your hard drive.
Or you can always download the free trial!