RustDesk is also open source including the server so you can fully self-host.

I've noticed that RealVNC has hidden their formerly free VNC desktop client, now called RealVNC Classic Viewer, behind an enterprise subscription login, and replaced it with a different cloud first thing, RealVNC Connect Viewer, that requires a login to at least obtain, and is anemic in terms of features.

Not that RealVNC is VNC. However, enshittification has clearly taken another scalp.