For the people who have played transport tycoon deluxe: open TTD is an opensource version of this game where you run your own transport tycoon business (similar to roller coaster tycoon but instead you run a transport tycoon which is more challenging)
* OpenTTD supports multiplayer games for up to 255 players between 15 different transport companies can be played both over a LAN or over the Internet
* Open source
* 64Bit version available and also playable on Linux, BSD, solaris and Mac
* Mods
Tutorials:
http://wiki.openttd.org/TutorialInstallation tutorial for HD graphics:
Go to the beginning of the video if you never downloaded an app before and don't know how to click next and thus need a tutorial on how to install open TTD.
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