wkhtmltopdf - wkhtmltopdf is an open source (LGPL) command line tools to render HTML into PDF and various image...
HalftonePro - Create custom vector halftones quickly and easily
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Headspace - Meditation made simple. Brilliant things happen in calm minds.
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
Comixology Unlimited - Netflix for comics and graphics novels by Amazon