There are a few downloads on the net
1) camquest 6; is free from competition cams. Pretty close the times that I used it. http://www.compcams.com/Pages/409/camquest-6.aspx
2) desktop dyno; I have used this one a few times but it always show higher torque numbers than actual.
3) Dynosim 5 ; I have never used this one but know some guys that have & they swear it is dead on
I'm sure there are alot more out there. Just remember enter as much info as you can Garbage in garbage out.