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Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Roundcube - Web-based IMAP email client
Google Calendar - Spend less time managing your day & more time enjoying it
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.
Lightning Calendar - Organize your life — it’s about time!
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).