Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Ecommerce Senders - Live email marketing insights for the top 100 Shopify stores
EmailWay - Collection of the most insightful and informative email newsletters from across a wide spectrum of industries and interests
BiggerCake - The data tool that Kickstarter deserves
Really Good Emails - A large collection of good product email design.
Email Insights - Email Insights - Analytics for Marketers