The software that runs your poker night, so you can actually play it.
I host a weekly poker game. For years it ran on a phone timer, payouts worked out on a napkin, and a league table in a spreadsheet only I could read — so I built the thing I couldn't buy.
The Club House started as a blind timer for my own table and grew into the app home games, pub leagues and clubs run their whole night on. I'm still the host, which is the whole method: every release comes out of a real game and goes back into one.