in fact I'm working on several, because the intention is experimental: I'd like to test different methods of shuffling the cards, and invite users to see which algorithm "feels" better to them, more likely to give satisfying readings. pure randomization isn't necessary the way—and anyway, there's lots of ways to generate pseudorandom numbers.
using HTML5 / Javascript with a spot of PHP. during testing, of course I got a Tower reading.
~Chara (and the gang)