Nawvel - Nawvel is a handy-dandy library of tried, tested & curated resources.
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Startup Network - Predicting successful startups using AngelList data
WhoSentWhat - We bring email newsletters from inbox to web
Google Design Sprint Starter Kit - This Kit helps you to run your first Google Design Sprint.
EmailWay - Collection of the most insightful and informative email newsletters from across a wide spectrum of industries and interests