PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
PaperScan - PaperScan Scanner Software is a powerful TWAIN & WIA scanning application centered on one idea: making document acquisition an unparalleled easy task for anyone.
PDF Arranger - Small python-gtk application, which helps the user to merge or split pdf documents and rotate, crop...
PaperSave - PaperSave is a complete document management, electronic workflow and transaction (invoice and gift) automation solution, for Microsoft Dynamics and Blackbaud.
Debenu PDF Tools - Simple to use solution to merge PDF files, edit document properties, add and edit custom metadata, convert images to PDF, convert PDF to text and much more.
ccScan - ccScan provides solutions to scan or import documents directly to the cloud storage providers.