Plan - Plan is a better way to organize.
MJML - The open source framework for responsive emails
Streaks - The to-do list that helps you form good habits.
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.
Taskful - Deadlines, meet your match.
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.