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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.
Roundcube - Web-based IMAP email client
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Cypht - All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.