HTMLEmail.io - Responsive HTML email templates for startups & developers
Really Good Emails - A large collection of good product email design.
Pistachio Email Templates - Delicious newsletter templates built for automation
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
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.
Startup Emails - Responsive HTML email templates for startups