Foundation : An easy to use, powerful, and flexible framework for building prototypes and production code on any kind of device.
Bootstrap : Build responsive, mobile-first projects on the web with the world's most popular front-end component library.
Bootstrap is an open source toolkit for ...
Email Standards Project : The Email Standards Project is about working with email client developers and the design community to improve web standards support and accessibility ...
Can I email… : Support tables for HTML and CSS in emails.
Email-Blueprints : Email Blueprints is a collection of HTML email templates that can serve as a solid foundation and starting point for the design of emails.
A Responsive Email Framework from ZURB. Quickly create responsive HTML emails that work on any device & client. Even Outlook.