Don't give up on playing new games because money is tight. There are free sim games that will satisfy your need to play something different. Save your cash for the games you cannot live without.
1. "Flight Gear"
"FlightGear" is an open-source project developed by a community of gamers looking for a solution to their needs the publishing giants was not solving. You won't find a flashy game with no substance here. Realism is what it's all about.
"SimuTrans 128x128" is a transportation system fans of "Railroad Tycoon" or "Transport Tycoon" will appreciate. You define your goals. Maybe it's too earn lots of cash. Or it could be that you just want to build fully functionally transportation system that runs with little intervention. Download a graphics pak to change the appearance of your town. Maybe you'd prefer a Japanese inspired town?
"C-evo," created by Steffen Gerlach, is based on "Sid Meier's Civilization." You work towards building an empire, while researching technology, defending and beating other civilizations, exploring, and diplomacy. Choose a civilization and build your city through time.
FreeCiv is Open Source.
This is an excellent alternative to "Civilization," for those of you who don't like spending a lot of money on games. The free sim is available for many operating systems.
Screenshot © Lincity Dev Team.
"LinCity-NG" is a city building simulation that is an updated version of "LinCity." Building and managing the city is your main goals. To complete those goals you have to build residence, provide food, update technology, energy sources, while keeping the city stable.
Screenshot © Focus Home Interactive.
"TrackMania Nations Forever," the sequel to "TrackMania Nations," is free for downloading and even includes online play! A total of 65 courses with all types of difficult levels and focuses. Some are about speed, others are about obstacles.