Hi all, its been a while since I was involved in FlightGear but I just found NASA's software catalog for air traffic management " https://software.nasa.gov/aeronautics " looks like a lot of goodies that can be used by FlightGear to take care of some back end systems like ATC and Conflict resolution software. Looks like a lot of goodies some of you will drool over if you haven't already!
https://software.nasa.gov/aeronautics
Most software is released for US and Foreign use, it will state on the page.