PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.
ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
ScanKromsator - Scan Software with several advanced options