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MJML - The open source framework for responsive emails
Dragon Responsive Email Designer - Dragon Email Designer provides an intuitive drag and drop newsletter design tool.
Email Design System for Sketch - Sketch file with 10 email templates for designers
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.
Getform - Smart form endpoints. The modern way to build the form backend.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.