BeeFree - BeeFree is an all-in-one solution that works anywhere you are.
Design Principles - An open source repository of design principles and methods
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.
UX Research Field Guide - Your map to the world of UX research 🌏🕵️♀️
MJML - The open source framework for responsive emails
UX Design Weekly - The best user experience links each week to your inbox