PDFium - The C# PDF Library to Create and Edit PDF documents in .
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.
Document Cyborg - Easily save a web page as a document (PDF, WORD, EPUB, ODT, RTF or Text)
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
PDF Shaper - a collection of PDF tools and utilities to modify and optimize your PDF documents and its content
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request