dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.
Wondershare PDFelement - All-in-one PDF editor