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 ...
Spectre.css : Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
lightweight and clean starting point for your...
lit : a ridiculously small responsive css framework
HTML EMAIL BOILERPLATE : This website and its sample code creates a template of sorts, absent of design or layout, that will help you avoid some of the major rendering problem...