ROUNDCUBEMAIL CARDDAV
This is a plugin for the Roundcube webmailer to access CardDAV servers like owncloud, davical, a Google addressbook or a davmail server.
RCMCardDAV supports autodiscovery of your addressbook url via .well-known URLs so you can just point it to your servers base url.
If you also have an Androidphone I suggest using the excellent CardDAV applications from dmfs.org: