Cross-platform C++ libraries for building network applications
Air traffic control tower and radar simulator (solo + multi-player)
Speaking Air Traffic Controller Simulator for Flightgear
an osm openstreetmap 3D / bing maps car / flight / ballon sim game
A color-code design tool
BlueSky Open Air Traffic sim, (Windows/Linux/Mac, Python 2.x based)
Conflict Resolution for Air Traffic Control
Air Traffic Controll Simulator (ICS Project)
GSM air interface