Visual Similarity Duplicate Image Finder - Visual Similarity Duplicate Image Finder will find similar and duplicate photos. Organize photos easily - supports 300+ Image Formats Including RAW.
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
Fast Duplicate File Finder - Find and Remove Duplicate Files, Find Similar Files, Free Duplicate File Finder will Delete Duplicate Files, MP3, iTunes, Songs, Images, Photos and Picture Files.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Duplicate File Fixer - Duplicate File Fixer is a highly accurate and powerful app that analyzes and deleted duplicate files that exist on your smartphone or tablet.
Pixiple - Find images similar in pixel and/or metadata content