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CloneSpy is a Free Duplicate File CleanUp Tool for Windows.

Checks invalid, duplicate email addresses in a mailing list.

Find duplicate files, even with different names.

you can use it only for one simple task: to check for duplicate lines in 2 files

Desktop Search tool and Find Duplicate Files tool.

Twin Files identifies files that are empty, trash, or duplicate other files.

Easy and hassle-free duplicate files removal tool with some cool features!

fast and flexible application for finding and removing duplicate files.

GEAR's Professional Edition can Duplicate CDs and DVDs .

Delete Outlook duplicate records with Anti-Dupe for Microsoft Outlook add-in