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.

FoxyUtils Online PDF Tools - All the PDF tools you need! Save time with our easy to use online tools to merge, split, convert, and edit PDF files.

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

To EPUB - Instantly convert text documents and ebooks to EPUB format with this free online EPUB converter.

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

Sigil - Sigil is a multi-platform WYSIWYG ebook editor. It is designed to edit books in ePub format.