FlightGear is one of the best Flight Simulator you would ever find, with support for various Operating Systems like Windows, Mac OS, Linux and Much more.

Commander Stalin, is a free and open source strategy game. The game is set in the Soviet Union ruled by Stalin. The player is Stalin. He must organize the state, industrialization and turn it into a major power. This should effectively manage their resources, creating a broad base of social support (workers), launching the existing [...]