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.
ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
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
Chart.js - Easy, object oriented client side graphs for designers and developers.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Famous Engine - The Famous Engine is a free and open source JavaScript rendering engine.