Redmine - Flexible project management web application
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.
Basecamp - A simple and elegant project management system.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Roundcube - Web-based IMAP email client