HTMLEmail.io - Responsive HTML email templates for startups & developers
Awesome Mails - Awesome Mails creates beautiful image map emails, featuring an easy to use drag-and-drop editor...
MJML - The open source framework for responsive emails
Flexmail Solution - Professional email marketing with powerful and easy-to-use features
Paperplane - High quality HTML to PDF conversion API for developers.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.