Engine dyno software. Anything good on the Internet?

I was lucky and found my old copies of Engine Analyzer and Drag Strip Analyzer I had purchased in the 1990's that I had hidden away in my old diskette box (remember floppy's and 3 1/2 diskettes?). I pulled out my old PC I had sitting on the shelf and was able to run the program so I am back to doing some what if calcs.

Thanks for all your inputs.