HTMLEmail.io - Responsive HTML email templates for startups & developers
Liramail - Design your brand emails within minutes with Liramail Editor
Startup Emails - Responsive HTML email templates for startups
EvaWarm - MAXIMIZE EMAIL DELIVERABILITY WITH A MANUAL WARMUP TO INCREASE YOUR OPEN RATE
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.
Really Good Emails - A large collection of good product email design.