GUI tool to find duplicate files in a system

 dupeGuru is a tool to find duplicate files on your computer.
 .
 It can scan either filenames or contents. The filename scan features a
 fuzzy matching algorithm that can find duplicate filenames even when
 they are not exactly the same.
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 dupeGuru is customizable: you can tweak its matching engine to find
 exactly the kind of duplicates you want to find.