Really Good Emails - A large collection of good product email design.
SaaS Email Templates - Responsive HTML email templates for SaaS startups
Email Love - Email design inspiration, templates and discovery
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.
Email Template Generator - Email templates for your important relationships