A photo deduplication tool. For some reason I always resort to writing small, scenario-specific python scripts. A couple of reasons I can recall:

- 3 or more input directories which have specific roles like "main archive, prioritize", "temp folder, remove from here first"

- multiple levels of equivalence test, including file name, exif tags, checksum, perhaps perceptual hash (e.g. for flagging downscaled images to be deleted)