FlightGear is an open-source flight simulator. It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. Source code for the entire project is available and licensed under the GNU General Public License.
There are no registered leaders of this group. This can be granted to the right person on request. Also why don't you join the community, we welcome creators and consumers alike and look forward to your comments.