With so many ADSB receivers feeding data into Flight Aware, Flight Radar 24, and other aggregation sites I am not surprised to have stumbled onto this.
The PSXseecon Traffic injector grabs real world ADSB data and feeds it to your MSFS, Prepar3D, or FSX flight simulator for you to see and enjoy in real time.
I haven't found anything like this for X-Plane yet but if I do I'll be sure to post about it.