Simutrans

Simutrans is a cross-platform simulation game in which the player strives to run a successful transport system by constructing and managing transportation systems for passengers, mail and goods by land, air and water between places. Like OpenTTD, Simutrans is an open source transportation game based on the Transport Tycoon idea. Simutrans was originally written by Hansjörg Malthaner but it is now maintained and developed by a development team and an international community of volunteers. Simutrans is officially available for Microsoft Windows, Linux, BeOS, Intel & PPC Mac OS X and AmigaOS 4.x under the Artistic License which was adopted in 2007. Prior to that, Simutrans was a closed source game and was developed internally. Nightly builds for Simutrans and the main PakSets are also released. Currently the stable release of Simutrans is version 120.0.1 as of November 25, 2014. There is a popular branch of the code called experimental, which aims to extend the basic game.