This repo provides SNAP packages available as fslint-unofficial for fslint GUI tool.
FSlint - A utility to find File System lint. This includes duplicate files, empty directories, problematic filenames, etc.
Tool is pretty useful for finding file duplicates and performing other bath processing on big sets of files. I love it, but sadly it's not longer available in Ubuntu 20.04 because of lack of Python 2.x support. I know it should be properly updated, but getting it working like that was just good enough for me ;)