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SaaS Email Templates - Responsive HTML email templates for SaaS startups
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Pistachio Email Templates - Delicious newsletter templates built for automation
Email Template Generator - Email templates for your important relationships
Transactional Email Templates by Postmark - Open source email templates for use in your SaaS app.
Litmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.