http://en.wikipedia.org/wiki/CardDAV
https://github.com/Kickball/awesome-selfhosted/blob/master/README.md#calendar-and-address-books
http://www.inf-it.com/open-source/clients/infcloud/
InfCloud is an open source CalDAV/CardDAV web client implementation released under GNU Affero General Public License (version 3.0).
https://gitlab.awesome-it.de/kolab/roundcube-plugins (CalDAV client for Roundcube)
http://googleblog.blogspot.ca/2012/12/winter-cleaning.html
http://evertpot.com/jcard-completed/
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