Top 5 carddav open source projects

WebDAV, CALDAV, and CARDDAV client for Nodejs and the Browser

The Radicale frontend of Modoboa

DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.

calcardbackup: moved to https://codeberg.org/BernieO/calcardbackup

📓 A command-line PHP script allowing to import CardDAV-based VCards (e.g. from 'owncloud') to a phonebook in a AVM FRITZ!Box