dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.
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
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
CloneSpy - CloneSpy is a Free Duplicate File CleanUp Tool for Windows.