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.

docassemble - docassemble is a free, open-source expert system for guided interviews and document assembly.

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

Knackly - Generate contracts, emails, or other documents of any complexity by automating your knack for doing...

PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request

XpressDox - XpressDox Desktop for Microsoft® Office Word is an affordable document assembly system.