Nextcloud contacts gives you CardDav, so it works with Android, iOS, and any number of Linux/Windows/Mac clients. Thunderbird certainly, and many other desktop mail clients. (Don’t know about a Linux or Windows app limited to just contact management over CardDav, but it’s probably out there.)
Nextcloud contacts gives you CardDav, so it works with Android, iOS, and any number of Linux/Windows/Mac clients. Thunderbird certainly, and many other desktop mail clients. (Don’t know about a Linux or Windows app limited to just contact management over CardDav, but it’s probably out there.)