my favorite currently is
The Zone (by Nils vo)
https://store.steampowered.com/app/3491280/The_Zone__FPV_Drone_Simulator/it's a prerelease and looks shit but it has the best physics and he's a single developer from germany and i think it deserves some support. Also quite notably it hase very easy custom map integration with blender so you can easily make custom maps :).
Other than that uncrashed for it's graphics and freestyle and velocidrone for racing, i'd say.