The wonderfully modifiable rFactor from ISI offers a great sim experience with a wide variety of cars on a great variety of tracks.

Bob's Track Builder has supported rFactor from the beginning and now can export to rFactor's native format making it even easier to create and test a track. BTB will continue to add more features as time goes by.

Close support from both the community and ISI will see BTB used in more high profile projects that are currently underway.