I played around with FlightGear a few years back. They have a couple of interfaces like UDP and the like, but that was harder to use. Anyway, they have a web interface, and that's where I found a websocket which can stream all the info and set all the values I needed.

I then used it to dampen the input of a flight yoke. The flight yoke was nearly unusable when unfiltered/undamped but nicely usable after that.