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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
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
mailcow - An open source mailserver suite.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
CrossBox - Designed for those who settle only for the best — CrossBox is beautiful, dazzlingly fast, and comes with advanced features that provide you and your team with cutting-edge communication technologies.