Maybe you've created your own AR program for wearables that shows the definition of a word when you highlight it IRL, or you've built a personal calendar app for your family to display on a monitor in the kitchen. Whatever it is, I'd love to hear it.
Some 30 years ago, I reverse-engineered the format of Prince of Persia's save files and wrote a little C program that would create a save file for any place / level in the game. Just because I could...