* [http://www.flightgear.org/ FlightGear]
* [http://flyingguns.com/ FlyingGuns]
* [http://opensimulator.org/ OpenSimulator]
* [http://www.kolls.net/rwwiki/ Rail World]
* [http://rigsofrods.com/ Rigs of Rods]
* [http://x-plane.com/SpaceCombat.html Space Combat]
* [http://www.x-plane.com/ X-Plane]