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.
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.
XSane - A good proposal for SANE-2 has been written.
Book Scan Wizard - A utility to help with Book scanning using cameras as a scanner.