Email Design System Playbook - Learn to design emails faster with a design system
UpLabs - The best material design, iOS & web resources, every day
Eva Design System - A free customizable design system
Componly - The design system OS
Prokit - Curated UI Kits - Get a head start on your next project with editable designs
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.