dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
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.
Duplicate Media Finder - Duplicate Media Finder locates and deletes identical files and similar media