Wabbitemu - Wabbitemu is an accurate emulator for Texas Instruments based calculators TI-73 to TI-86.
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
CEmu TI 84+ CE Emulator - Emulates the TI 84+ CE and TI 83 Premium CE calculators from a ROM dump from a real calculator.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Emu48 - HP38/39/40/48/49 Emulator
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.