Mosaico.io - Outstanding opensource email template editor by VOXmail.it
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Topol.io - Create professional Email templates easily - Drag & Drop Email Builder.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
BeeFree.io - Bee is MailUp's drag-&-drop editor for responsive design emails.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.