Two more

[wheelman59]

I've had good luck with both of these:
Moto Carrera: http://www.motocarrera.com/
Spec II: http://www.spec2.com/

[jrodenhi]

I've had good luck with both of these:
Moto Carrera: http://www.motocarrera.com/
Spec II: http://www.spec2.com/

Although the site is still up, MotoC is out of business