fdupes - FDUPES is a program for identifying or deleting duplicate files residing within specified...
Rdfind - Rdfind is a program that finds duplicate files.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
i-DeClone - AI-powered duplicate file search and clean-up. Find identical and similar photos, music, documents etc
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.