Would have said baikal if you haven’t alteady mentioned it. Can’t confirm that it’s a bitch to maintain, runs in my webjail for more than a year now. (Before I used nextcloud which IS a bitch in all matters…) The only hiccup was self induced, forgot to install it after php upgrade (FreeBSD, pkg is named php83-baikal for example).

Specifically for webdav (Joplin sync) I use dave, though unmaintained no issues so far (internal network only, not web facing).

+1 for Joplin. Sync via webdav-server (nginx, nextcloud) or their sync server. Works like a charm.