Racer is a great looking free car racing simulator. It's main aim is to create a realistic driving experience and Racer's physics engine certainly proves this.

Racer has many great features apart from the actual physics engine. There are many great graphical features like skid marks, smoke and lens flare. Racer also allows you to create your own cars and tracks. Although the game itself does not come wih many cars and t racks you can download them from 3rd party websites. For example there is a great looking Monaco track.