Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.