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.
Nebo.app - Highly acclaimed note-taking app powered by advanced handwriting recognition.
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
Pen to Print - Pen to Print: Convert handwriting to text created and published by Serendi LTD.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Handwriting - Handwriting is a feature-rich fun app that provides you with the ability to create handwriting and paint notebooks on your Android devices.