List of Top Free Open Source & Self Hosted Application for Communication - Email - Mailing Lists and Newsletters

Mailing list servers and mass mailing software – one message to many recipients.

Dada Mail – Web-based list management system that can be used for announcement lists and/or discussion lists. GPL-2.0 Perl
Gray Duck Mail – Self hosted email discussion list management that uses external email providers. GPL-3.0 Docker
HyperKitty – Open source Django application to provide a web interface to access GNU Mailman v3 archives. GPL-3.0 Python
Keila – Self-hosted reliable and easy-to-use newsletter tool. Alternative to proprietary services like Mailchimp or Sendinblue. AGPL-3.0 Elixir
Listmonk – High performance, self-hosted newsletter and mailing list manager with a modern dashboard. AGPL-3.0 Go
Mailman – The Gnu mailing list server. GPL-3.0 Python
Mailtrain – Self hosted newsletter application. GPL-3.0 Nodejs
Mautic – Mautic is marketing automation software (email, social and more). GPL-3.0 PHP
phpList – Newsletter and email marketing with advanced management of subscribers, bounces, and plugins. AGPL-3.0 PHP
Postorius – Web user interface to access GNU Mailman. GPL-3.0 Python
Schleuder – GPG-enabled mailing list manager with resending-capabilities. GPL-3.0 Ruby
Sympa – Mailing list manager. GPL-2.0 Perl