Earlier this year I published Email Kit, a flexible design system of guidelines, elements, components, templates and content packs that allow you to create amazing responsive emails fast.
I'm now taking what I learned creating Email Kit and starting to build a SaaS platform for email developers, designers and marketers.
You can still access Email Kit at https://www.vouchful.com/email-kit/ but I will begin to migrate content over to https://www.emaildeveloper.com along with adding some exciting new functionality.