The good OwnCloud is abandoned, and instead they released some meme enterprise nonsense.
I'm running NextCloud, but I hesitate to call it good, because of its kitchen sink approach to features. I really want 2015 era OwnCloud with just files, it being PHP/MariaDB/Apache-based. I refuse to use anything that requires Docker, which is most of the slop alternatives currently available.
I run nextcloud on a NixOS server within a systemd container, so no Docker.
You can remove almost app in Nextcloud. It is pretty modular. You can have a files only Nextcloud, last time I tried.