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.
FreeBu - Smart free/busy calendar sharing and meeting organizer.
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
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
FullCalendar - FullCalendar is an open-source JavaScript event calendar.