ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
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.
K2PDFOPT - K2pdfopt (Kindle 2 PDF Optimizer) is a stand-alone program which optimizes the format of PDF (or...
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
Genius Scan - On The Go.