Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
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.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
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
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request