The Starter Kit - Curated resources for web developers and visual designers
Hunter Templates - Collection of best-performing cold email templates
Google Design Sprint Starter Kit - This Kit helps you to run your first Google Design Sprint.
Nawvel - Nawvel is a handy-dandy library of tried, tested & curated resources.
mlist - Email newsletters, outside of the inbox
Templates Library by Helppier - Curated directory of 40+ in-app messaging templates for SaaS