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...
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.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Pixiple - Find images similar in pixel and/or metadata content
AntiDupl - AntiDupl.NET can find and display duplicate images in the main graphic formats: JPEG, GIF, TIFF...