FlightGear Flight Simulator: free open-source multiplatform flight sim
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Air traffic control tower and radar simulator (solo + multi-player)
Opengate is a Jumpgate remake
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Generate X-Plane 11, 10 and 9 scenarios from OSM data
a webgl Cesium 3D flight simulator
an osm openstreetmap 3D / bing maps car / flight / ballon sim game
InfiFly a ML based 3D game.
Highly realistic and immersive model for Flightgear.
3D Space Station Simulator (inspired by SS13)