Tiny Scanner - Fast and easy to use mobile document scanner.
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
Docus - Docus is a simple yet powerful Document Scanner for Android that enables you to scan various types of documents with great ease.
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
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.
XSane - A good proposal for SANE-2 has been written.