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dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
4dots Free PDF Password Remover - 4dots Free PDF Password Remover can remove a password from a PDF file.
CloneSpy - CloneSpy is a Free Duplicate File CleanUp Tool for Windows.
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Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC