A simple group randomizer for the classroom. Inspired by this Team Picker Wheel, but I needed something very simple due to browser lag on my school-issued laptop.
See a demo at http://tools.rohrbachscience.com/group-randomizer/.
It's just one file. Feel free to copy and save it. There's no configuration. Or--for that matter--just feel free to use it on the Demo Website. It stores all the data using the HTML5 Web Storage API, so there's no server-side infratstructure needed.