riseup-vpn (a great easy to use VPN)
FlightGear (A wonderful open-source promising Flight simulator, which growing day-by-day, and might one day be at par with Microsoft Flight Sim -a must-try project.
By the way, it is increasing in popularity day by day)
FlightGear-data (Important Dependency of the above)
Simgear (Important Dependency of the above)
plib (Important Dependency of the above)
Already a topic for this
Perhaps give a reason too why you think these applications would be useful.
Especially since flightgear is currently flagged out of date.