MailPoet - MailPoet is an email newsletter plugin for Wordpress.
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!
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM