Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
JPEG to PDF - JPEG to PDF is a free program that can convert image files to PDFs.
XSane - A good proposal for SANE-2 has been written.
JPG to PDF Converter - Free online conversion of images to PDF files.
NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
JPG 2 PDF.ru - Combine multiple JPG images into one PDF file