ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
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.
Book Scan Wizard - A utility to help with Book scanning using cameras as a scanner.
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
PDF Scissors - Crop pdf. Drop margin, whitespace. Auto crop all pages. Easy feature to make nice cropped pdf for ebook readers such as Amazon Kindle, Sony, Cybook etc.
Scanbot - Scanbot is a mobile app that allows you to use your device's camera as a document scanner. The app is capable of scanning a large number of source materials, and it can handle QR codes as well.