MJML - The open source framework for responsive emails
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
Email Design System for Sketch - Sketch file with 10 email templates for designers
PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
Getform - Smart form endpoints. The modern way to build the form backend.
StartupBase - Community of makers & early adopters