I've developed an application that calculates exact EV and optimal strategy for certain card games (first one was BlackJack).

I Can Tell Time turns reading an analog clock into a playful, step-by-step adventure for kids.

Set a delay, perform your skill, and instantly watch the playback to refine your technique. Used by athletes, coaches, and students for golf, gymnastics, dance, martial arts, and more. Available as a chrome extension and web app/api