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Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Baïkal - Cal and CardDAV server
Roundcube - Web-based IMAP email client
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
SOGo - SOGo is groupware server with a focus on scalability and open standards.