ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
ScanKromsator - Scan Software with several advanced options
PortableSigner - PortableSigner is a signing (with X.509 certificates) program for PDF files.