Free-Invoice.co.za - Free Invoice Software | Free online tool that helps small businesses to generate free invoices and manage their contact list. It can be used as an alternative to expensive invoicing software and online invoicing applications
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
Invoice.to - A simple & beautiful invoice generator with Stripe & Paypal
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
Free Invoice Generator - A free invoice generator for startups
XSane - A good proposal for SANE-2 has been written.