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Zelos - A very simple app for mobile teams - tasks and chats on desktop and mobile.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Librelist - Librelist is a free as in freedom mailing list site for open source projects
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
OnlineGroups.net - A hosted mailinglist manager service