Fly! does have other than GA aircraft, as was stated above. Shareware scenery, aircraft, and panels are on their way unless I'm mistaken. One has to keep in mind that the sim is quite new.
I think these links have shareware stuff on their way:
http://www.bconnex.net/~abarstad/fly.html
http://avsim.com/hangar/utils/canucks/
http://www.avsim.com/ go to file library
Cosmo