Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Nacho Analytics - View any company's analytics
EmailWay - Collection of the most insightful and informative email newsletters from across a wide spectrum of industries and interests
ChatWhale - Gamify your customer communication and loyalty rewards
Really Good Emails - A large collection of good product email design.
Social Insider - Get an inside view of your competitors' Facebook activity