If you don't need traffic data, CoMaps (uses OpenStreet Map data).

If you do need traffic data (understandable) Magic Earth is what I use. It's unfortunately not fully open source, only the map data is from OSM, but I find the navigation good 95% of the time, sometimes you have to make your own judgement for if a route might have bad traffic. At least it's not Google or Apple, and no ads.

I don't do car play, so I have no idea about how that works.

I wish we had better alternatives or that cars all exploded and we went to public transport and walkable cities