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!
SendX.io - SendX (https://sendx.io) provides remarketing and retargeting tools for web businesses. You can use popups, landing pages, email, web push notification, automation workflows and FB / Google retargeting to drive more revenue.
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Automizy - Email marketing automation for non-technical users
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Zagomail - Zagomail is an email marketing and automation platform built to help small business and e-commerce marketers to grow their audience and boost their sales by using our best features including marketing automation.