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Roundcube - Web-based IMAP email client
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.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
HEY - Email at its best, new from Basecamp.