Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
HTMLEmail.io - Responsive HTML email templates for startups & developers
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!
Startup Emails - Responsive HTML email templates for startups
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!