New ask Hacker News story: Ask HN: Have you created programs for only your personal use?

Ask HN: Have you created programs for only your personal use?
20 by smarri | 15 comments on Hacker News.
Curious to know if anyone has written programs for their own, regular, & personal use. And if so what they are? E.g. A colleague of mine tracks all of his homes energy use through a custom program which disaggregates the energy consumption per device and outputs a report to a tablet.