Checklist Design - The best UI and UX practices for production ready design.
BeeFree - BeeFree is an all-in-one solution that works anywhere you are.
UX Design Weekly - The best user experience links each week to your inbox
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.
moyo - Make your UX qualitative testing easier with moyo
MJML - The open source framework for responsive emails