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.
Pretty simple but saved me a lot of time: using Twilio, Google maps API, and PythonAnywhere I would send myself a text if my normal route to work would take >n minutes.