I mean placing your phone in one of those car holders or having someone else hold it. It may not be entirely as convenient as having it displayed on a built-in screen, but it’s Google-free and works. I don’t think there are any full software alternatives, because to my knowledge, the car has to allow apps to access the monitor, so you can’t just have any app there. Whatever other things Android Auto does, you should be able to do with just your phone.

I guess the alternative is to get something to hold your phone in place.