SOGo: Open Source Groupware
www.sogo.nu/english.html, posted 2011 by peter in calendar collaboration email free linux messaging software sync
SOGo is fully supported and trusted groupware server with a focus on scalability and open standards. SOGo is released under the GNU GPL/LGPL v2 and above.
SOGo provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV.