I work on these for fun in my spare time. Polish varies. Few have a larger user-base, most others are just used by me. Typically only 1 or 2 are actively worked on at any given time.
Arduino-based ultrasonic distance sensor to determine standing desk height. Integrated with home automation.
Linux experiments and tinkering. Syscalls, namespaces, kernel modules and more.
Distributed Systems experiments. Kubernetes, Terraform, GraphQL, others.
Datascience and Machine Learning notes and experiments.
Simple data aggregation scripts for InfluxDB. Used to aggregate stats from home automation sensors.