Foreflight Relay - because it includes Traffic in scope. When injecting traffic using FSLTL (which pulls from FlightRadar24 real flight data), this traffic shows up on the real time map in Foreflight, matching what you see on the MFD map. Because I have PFD and MFD hardware (RealSimGear), I don't have the PFD and MFD on my flight display, and it's excellent to have the traffic on the moving map. I found that various other Foreflight integration tools did not include Traffic in scope.