dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
Rdfind - Rdfind is a program that finds duplicate files.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
FSlint - FSlint is a utility to find and clean various forms of lint on a filesystem. I.E.
Easy Duplicate Finder - Free download! Find and delete duplicate files with Easy Duplicate Finder™. Get rid of annoying duplicates on your Windows and Mac.