Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
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
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
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.