Bus Simulator - download it here
If you are looking for a good bus simulator, you will come across three names: "Bus Simulator", "Bus & Cable Car Simulator" and "OMSI". Unfortunately there are no free bus simulators.
Bus Simulator 2008
In the "Bus Simulator 2008" you drive through 24 missions in eight different buses. In addition to various lines, special and day trips as well as difficult weather conditions such as rain and snow await you. In the free demo version, however, only one bus is available on a mission.
Bus & cable car simulator
If you have always wanted to drive the legendary cable cars in San Francisco, then the "Bus & and Cable Car Simulator" is the right place for you. Because here you drive not only by bus through the American city, but also by cable cars. This is an old tram pulled by winches. The free demo limits the fun to two hours.
OMSI
"OMSI", short for omnibus simulator, is limited to the city of Berlin. In two double-decker buses from different years of construction you drive on two routes through the Berlin district of Spandau. In addition, countless other buses and routes can be added because the simulation supports mods. You can buy and download OMSI for currently 24 euros in the developer's shop.