OpenTTD is a clone of the Microprose game “Transport Tycoon Deluxe”, a popular game originally written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.

It has been originaly developed by the openttd team http://www.openttd.org and. This code 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 for PSP is just the port of the original pc version to be playable on PSP.

http://openttd.teamjak.net/