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.

DM Pilot - The Easiest and Most Reliable Way to Send Automated DMs

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

Auto Message - Auto Message is a scheduling app that offers several features such as sending automated emails, automatically answering calls & sending SMS/text messages.

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

Auto Reply for whats - Auto Reply for whats is a bot that automatically replies to received messages, and you can also use its features to build campaigns for customer support.