Engine dyno software. Anything good on the Internet?

Yeah, they're pretty entertaining. I can't think how many hours I must have spent (wasted?) just comparing different cylinder heads and cams on EAP.

One thing i am interested in is a feature which lets you eliminate reversion. average torque goes through the roof! I actually know someone who is trying to achieve this with reed valves on an aussie hemi six. It's gonna be fun testing it!