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.
Not really that high-tech or that interesting, but I've made a firefox add-on that sorts YouTube video tabs by duration. Recently I realized that someone else actually uses it too (he left a review), so I got motivated to patch it