Mailtrain - Self-hosted open-source Mailchimp clone
PEAR - Connecting newsletters and advertisers 🍐
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Revue - The easiest way to create and send a curated newsletter
Kill the Newsletter! - Convert newsletters into RSS feeds
Buttondown - Buttondown is the best way to start and run your newsletter