HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Good Email Copy - Email copy from great companies.
GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Good Sales Emails - Best sales emails from great companies
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Really Good Emails - A large collection of good product email design.