Mailtrain - Self-hosted open-source Mailchimp clone
Substack - Substack makes it simple for a writer to start an email newsletter that makes money from subscriptions.
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Supscrib for Business - Build engaging newsletter & save on email costs
Really Good Emails - A large collection of good product email design.
Stoop - Like a podcast app, but for newsletters 💌