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!
Mailmeteor - Send hundreds of personalized emails with Gmail.
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Vero Newsletters - The first "baseless" email marketing tool.
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Mailazy - Modern Email Delivery API