wkhtmltopdf - wkhtmltopdf is an open source (LGPL) command line tools to render HTML into PDF and various image...
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
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
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
pandoc - Pandoc is a Haskell library for converting from one markup format to another, and a command-line...
HTML PDF API - Easily generate PDF documents from HTML code with our powerful API