DocumentJS - JavaScript documentation engine. Create beautiful, articulate, multi-versioned documentation.
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.
ng-docx - Ng-docx is a library that automatically generates a documentation page to easily and beautifully view your markdowns.
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
JSDoc - An API documentation generator for JavaScript.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request