Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Mailtrack.io - The best email tracking solution I've found. Free
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
SendPortal - SendPortal is a self-hosted and comprehensive Email Marketing Software used by businesses worldwide.
Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.