GNU Mailman is a mailing list management software. Mailman project was started long time ago before the Millennium. Since its birth it has become the most intelligent tool for handling mailing lists ever. Huge number of companies with Fortune 500 members among them have been using Mailman for years. The new version Mailman 3 brings to us even better user experience and communication power.
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Zelos - A very simple app for mobile teams - tasks and chats on desktop and mobile.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Sympa - Sympa is an open source (GNU GPL) mailing list management (MLM) software.
Librelist - Librelist is a free as in freedom mailing list site for open source projects
MailChimp - MailChimp is the best way to design, send, and share email newsletters.