This entry is brought to you by Nektony, maker of Duplicates Expert.
Most Mac users' hard drives are clogged with space-wasting duplicate files. You accidentally create dupes when you copy a folder to a new destination without removing the original folder, download the same file twice, or back up your hard drive, among other ways.
Now you can find all those unneeded files with Duplicates Expert, the advanced duplicate finder. The Mac app scans your hard drive and any external drives, then provides a simple yet informative report about duplicate files and folders. It even flags similar items for inspection.
After scanning your drives, Duplicates Expert provides a visual report showing how much space each duplicate takes up, with the largest ones listed first. Then the app provides you with useful cleanup recommendations for fast, easy removal.
Duplicates Expert is loaded with great features that could speed up and simplify your Mac's performance: You'll find skip lists for files, folders and extensions; always/never select preferences; customizable scanning size options; and many more. It's the most powerful duplicate files finder around.
Available on: Mac OS X 10.9 and higher
Price: On sale for $1.99 for a limited time (usual price is $4.99)
Download: MacApp Store