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Transactional Email Templates by Postmark - Open source email templates for use in your SaaS app.
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Smart Templates by Sarbacane - Get customized email marketing templates from a URL 💌
Dynamic Email Template - Generate email template code with dynamic JSON data or API
MJML - The open source framework for responsive emails
Email Template Generator - Email templates for your important relationships