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Kin Calendar - The simple and connected calendar
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Google Calendar - Spend less time managing your day & more time enjoying it
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Teamup Calendar - Cloud-based calendaring using capability URL, application developed in Zurich, Switzerland.
mailcow - An open source mailserver suite.