LM Studio https://github.com/lmstudio-ai/lms

You don’t have to self host it. It works like TeamViewer. You install it on both the client and host and with the ID and Password you can then access your remote client. But if you want more control/privacy you can host your own relay server.

RustDesk. Also possible with selfhost servers.

Beeper is maybe an alternative. It is basically a matrix bridge. But not only for WhatsApp, also for signal and iMessage and many more. (Now in Beta, later 10$ a month subscription) https://www.beeper.com