A free program for Android, by AxesInMotion Casual.

Multiplayer Driving Simulator is an online free racing game that lets you play with friends and strangers in real time.

Drive a turbo sports car, go as fast as possible, and prove to the world how you can be the fastest racer! In this game, you can play with your friends without limits and restrictions like the usual policemen or traffic on the road. 

Multiplayer Driving Simulator features two primary settings: off-road rally zone and big city asphalt. You also have the prerogative to select your own GT cars. The only challenge here is how to surpass other players on the road.