Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
SendView - The best way to track your competitors' email marketing.
WhoSentWhat - We bring email newsletters from inbox to web
Owletter - Keep an Eye on Your Competitors' Newsletters
Really Good Emails - A large collection of good product email design.
Competitors App - Competitors App helps marketers monitor their competitors' marketing moves in one place, with very little time investment.