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@@ -121,6 +121,7 @@ Some [Groupware](#groupware) solutions also feature calendar/address book editin * [calypso](http://keithp.com/calypso/) - a python-based CalDAV/CardDAV server * [DAViCal](http://www.davical.org/) - a server for calendar sharing (CalDAV) * [Radicale](http://radicale.org/) - A Simple Calendar and Contact Server + * [sabre/dav](http://sabre.io/) - A open source CardDAV, CalDAV and WebDAV server. ## Communication systems |