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Zelos - A very simple app for mobile teams - tasks and chats on desktop and mobile.
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
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.