The World's Foremost Open Source Grand Strategy Game Community built maps, Axis and Allies game rules:

Download TripleA 100% open source, community run, free to play game Live lobby play, play by email, play versus AI

License

Copyright (C) 2001-2019 TripleA contributors.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

The complete license notice is available here.