scyy.fi/wcs-movecaller should go to a static web app, but in case it’s down, here’s the full HTML that you can paste into a text editor and open in your browser. This is a program that calls out semi-random West Coast Swing moves so that you can decouple practicing “choosing the next move on the fly” and “executing the move”.
In the radioactive mantle of a nameless planet dwelled the kahaldans, who lived in an air bubble in the rock and coated its inner surface with glowing farms of fungi. They enjoyed making new kinds of sounds and naming things, and would have named their planet but for their total ignorance of what a planet was.