Why is this interesting? - Every weekday Noah Brier & Colin Nagy (and friends) send an email about something interesting.

MJML - The open source framework for responsive emails

Hacker Newsletter - Best of Hacker News in your inbox every Friday.

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.

Hive - Seamless project management and collaboration for your team.

Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.