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Flight Gear Flight Simulator
http://www.flightgear.org/
Official site offers project information, images, and links.
FlightGear: Flight Dynamics Model Homepage
http://jsbsim.sourceforge.net/
Project is a new Flight Dynamics Model (FDM). Offers reference links and documents.
Philo Viveró's Pianomusic
http://www.philovivero.com/Sounds/
Offers theme songs in MP3 format.