GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
Docr - Docr is a free app for the iPhone smartphones that lets its users scan all of their documents into sharp images and, in the end, store them as PDF files.
Adobe Scan - Scan anything into a PDF using your mobile device.
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
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.
Genius Scan - On The Go.