ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
Tiny Scanner - Fast and easy to use mobile document scanner.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
DocScan - DocScan is a PDF document scanner application for the iPhone smartphones that lets the users to scan their documents and get them in the PDF files.
ScanKromsator - Scan Software with several advanced options
TurboScanner HD - TurboScanner HD is an app for iOS that enables you to convert the iPad or iPhone into a useful scanner and also serves as small fax or air printer in your pocket.