Haystack Search - Haystack helps you make the most of your time, by searching all your files and documents in the cloud in one place. It's been built for privacy from the ground up, so your data isn't stored on a server, just your computer.
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
MailJack+ - Send PDFs as postal mail
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
Paperkit - Create and download custom graph, lined, or dot grid paper
XSane - A good proposal for SANE-2 has been written.