Targeted.io - Test your email designs across 30+ clients before you send'm
Awesome Mails - Awesome Mails creates beautiful image map emails, featuring an easy to use drag-and-drop editor...
Really Good Emails - A large collection of good product email design.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.
Stamplia - High converting and beautifully designed email templates
Mizmoz - Easy-to-use, state of the art, email service provider dedicated to support growing businesses.