OpenTTD is licensed under the GNU General Public License version 2.0. For more information, see the file 'COPYING' included with every release and source download of the game.
OpenTTD is modeled after the original Transport Tycoon game by Chris Sawyer and enhances the game experience dramatically. Many features were inspired by TTDPatch while others are original.
OpenTTD v0.6.3 2009-02-23 build