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
I have one deployed project using a raspberry pi.
A water temp meter that reports the water temp at a local swimming hole to a private webpage. Built using a raspberry pi zero w, a timer, an MC battery, a DS18B20 sensor and a bash script running as a service on bootup.