Paperplane converts web pages to PDF documents. PDFs are rendered using Google Chrome, so the latest web standards can be used to author source documents. The API also allows you to convert multiple documents in parallel, and automatically uploads PDFs to cloud storage.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
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
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
HTMLEmail.io - Responsive HTML email templates for startups & developers
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.