MJML - The open source framework for responsive emails
StorifyMe - Create amazing web story experiences and engage your audience outside of social media
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.
ShiftX - A user-friendly, drag-and-drop, process visualization tool with connected data.
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Flowkit - Sketch library for user flows/content maps/annotations