Little programs or scripts or automations you’ve created ad-hoc to solve a particular single use case
I have lots of shortcuts i make on my phone and I have one i love that detects when bluetooth accidentally or purposefully disconnects from my speaker and reconnects it and fixes a playback glitch so its back to playing properly
Pi and touch screen photo frame . it reads a photos dir and just sets it as the background randomly every 5 mins using “feh” and “cron”.