Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.
Mailmeteor - Send hundreds of personalized emails with Gmail.
MJML - The open source framework for responsive emails
GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Streak - Manage customers inside Gmail