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.
POKATreader - With POKATreader you can read your PDF files in full-screen mode, but one of the best features is...
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-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
PDFZen - The powerful, simple, free online PDF editor for the masses; free yourself from the fax machine!