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.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Wondershare PDFelement - All-in-one PDF editor
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.