mikejuk writes "The latest version of FlightGear, 2.4, has just been released — and it has some significant improvements. Now it simulates weather so that you can ride the up draft from a range of hills and seek out thermals — but watch out for the simulated fog! For the future the implementation of an HLA interface means that you can build clusters of interacting simulators and perhaps even work with commercial flight simulators."
The FlightGear website
has gotten a long-deserved upgrade, too.