Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
SendPortal - SendPortal is a self-hosted and comprehensive Email Marketing Software used by businesses worldwide.
TinyLetter - Start writing your own newsletter instantly.
ListShine - Easy to use and affordable email marketing service with focus on simplicity and core features.