- you can configure Thunderbirds adressbook to read carddav too, needs some extension last I checked ( Provider for CalDAV & CardDAV :: Add-ons for Thunderbird ) , there certainly is a howto for this in this forum.
- KDE can handle carddav natively and it will work in Kmail
- for Evolution here are some screencaptures: [HOWTO] Sync /e/ calender with Evolution - but as said, when gnome online-accounts has the nextcloud / ecloud address once your Calendars and Addresses will turn up in gnome-contacts / gnome-calendar and Evolution by itself
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