Flight Simulator?

[doitashimashite]

I'm looking for a nice (preferrably open source) flight simulator. Any ideas?

[fct]

Mostly Flightgear: http://www.flightgear.org

Also, there is a combat one being developed (still not quite playable, I'm afraid): http://csp.sourceforge.net

[meborc]

flightgear is also possible to get via apt-get but as mutch as i know the pack in repos is .8 but the newest is .9 ... trying it out now :)