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.
PrintFriendly - PrintFriendly cleans and formats web pages for perfect print experience.
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
The Printliminator - The Printliminator is a simple tool you can use to make websites print better.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
priPrinter - Free version adds a text to every page printed. Use priPrinter to: - preview your print jobs