I wrote up a quick and dirty calculator for the Hutchinson system after seeing a request for it a few days ago. This is a Windows app - I may put it up as a web page if I get around to it. It's very quick and dirty, so PM me if there are bugs in it. I tested it until I got bored of dealing cards, so there's no guarantee that everyone works exactly right, but I don't know of any bugs at the moment.
Enter the cards as "ad" "ah" "2s" "3d". Use T for 10. Case shouldn't matter. The window will display the score, followed by "HIGH" if it qualifies as a high only hand.
Program is available here.
Source is available for paranoid types who don't like running random executables from strangers. I compiled this with Visual Studio.NET. Don't look at the code too carefully, cause it'll make your eyes bleed. I'd never used VS before, and I hope to avoid it in the future. The code is trash, but not maliciously so.
Hope this is helpful. Let me know if it needs improvement.