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

Numbertowords.net - Use this free online number to words converter to translate and spell out numbers perfectly and without mistakes. Writing numbers in word form has never been so fast and easy! Convert numbers in words in english now.

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.

Wonster Words - Award-winning ABC, phonics, and spelling app

PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request

Spell It Out - Spelling out tech acronyms so you can be in the know.