dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Wondershare PDFelement - All-in-one PDF editor
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.