NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
XSane - A good proposal for SANE-2 has been written.
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.