OpenTTD

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OpenTTD is an open source simulation game based upon the popular Microprose game "Transport Tycoon Deluxe", written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.

OpenTTD is licensed under the GNU General Public License version 2.0. The moderized 32bit graphics that come with the game are also under GPL compatible licenses.

www.openttd.org