Targeted.io - Test your email designs across 30+ clients before you send'm
Flexmail Solution - Professional email marketing with powerful and easy-to-use features
Really Good Emails - A large collection of good product email design.
Mizmoz - Easy-to-use, state of the art, email service provider dedicated to support growing businesses.
Stamplia - High converting and beautifully designed email templates
Kingmailer - Kingmailer helps you send, receive and route/forward emails.