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.

ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.

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.

Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.

Wondershare PDFelement - All-in-one PDF editor

ScanKromsator - Scan Software with several advanced options