PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
HTMLEmail.io - Responsive HTML email templates for startups & developers
HTML PDF API - Easily generate PDF documents from HTML code with our powerful API
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Api2Pdf - PDF Generation API, powered by AWS Lambda. HTML to PDF | URL to PDF | Office Doc to PDF | Merge PDFs . Supports wkhtmltopdf, Headless Chrome, and LibreOffice. No rate limits and no file size limits.
MJML - The open source framework for responsive emails