BeeFree - BeeFree is an all-in-one solution that works anywhere you are.
MJML - The open source framework for responsive emails
Mail Designer 365 - Discover Mail Designer 365, the easiest way to design mobile-optimized HTML emails, templates and newsletter designs. Your HTML email designer for Mac.
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.
Elite Email - Drag & drop email builder for awesome newsletters
EDM Designer - Make Responsive Email Templates. No Code.