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 ...
Ink : A Responsive Email Framework from ZURB. Quickly create responsive HTML emails that work on any device & client. Even Outlook.
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.
Foundation : An easy to use, powerful, and flexible framework for building prototypes and production code on any kind of device.
Tips, Resources and Patterns for Responsive Web Design
