Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
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
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
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.