I have written several software applications for the enjoyment of flight simulation enthusiasts who use Aerowinx Precision Simulator, version 10 (PSX) by Hardy Heinlin.
This software supports the use of PSX with versions of Microsoft Flight Simulator, version 10 (FSX) and enables FSX to serve as a scenery generator for PSX. It also works with Lockheed Martin Prepar3D. This then enables PSX to be used in an online environment such as the VATSIM network of pilots and air traffic controllers.
There is also a section for hosted software supporting PSX and authored by other developers.