Kdan PDF Reader - The All-in-One Document Expert Designed for the Increasingly-mobile Workplace.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Qoppa Software - Qoppa Software offers a suite of products that cover every aspect of PDF processes and integrate seamlessly into document workflows.
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
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...
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.