Open Transport Tycoon Deluxe

Open Transport Tycoon Deluxe (or OpenTTD) is based on the classic game Transport Tycoon. You can build road and rail networks, as well as airports and docks and then instruct your vehicles to carry cargo between destinations. There are several AI opponents to play against, or you can play online against the community of players who have probably devoted way too much time to the game. OpenTTD has just reached a milestone in its history as version 1.0 is finally available. Apparently the game ends in the year 2050 but it would take about 24 hours of playing for me to find out, so I haven't... yet. Overall this is well worth a download if you enjoy micromanagement games.