While not permanently free, the "Liftoff" sim often has free weekends on Steam. Add it to your wishlist. It runs decently on Mac via Steam's Proton, though slightly slower than Uncrashed via Whisky.
: Add the game to your library and click "Install." Uncrashed Fpv Drone Simulator Free Download For Mac
The developer has not released a Metal-native or Apple Silicon version. Therefore, even if you wanted to pay for the game, you cannot simply download a .dmg file and install it like a normal Mac app. While not permanently free, the "Liftoff" sim often