GitHub - foundation/foundation-emails: Quickly create responsive HTML emails that work on any device and client. Even Outlook.

MJML - The Responsive Email Framework

The only framework that makes responsive email easy mjml is a markup language designed to reduce the pain of coding a responsive email

Responsive HTML Email Framework

The email framework for creating responsive html emails templates supported on over 60 emails clients code your email templates confidently today

HEML

Acorn Email Framework | ThemeMountain Documentation

Acorn email framework documentation

Pine Email Framework | ThemeMountain Documentation

Pine email framework documentation

Maizzle - Framework for Rapid Email Prototyping

Maizzle is a framework that helps you quickly build html emails with tailwind css and advanced email specific post processing