AirBoard is a handy app I made to keep score during spontaneous tournaments that sometimes occur. The app is compatible with an Apple Tv, so when you mirror your iOS device's screen on the ATV, it shows the overall scoreboard.
This allows you to edit the list on the fly, and the secondary screen will update once you're finished. I'm planning to add a boatload of features to this app, such as saving a scoreboard, creating a tournament bracket from a scoreboard, and possibly inter-device communication. The UI assets do need an upgrade though...
Another cool feature is the ability to name the scoreboard by typing directly on the navigation bar.