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