Ask HN: Unusual personal automation and cloud services?

I maintain a few home grown services for my personal use.

- A recipe management system to simplify decision making when it comes to cooking.

- A graph database that I use like a massive mind map

- A few automations running on node-red for archiving and indexing my music listening and my product consumption habits

- A google alert like system made of patchwork that listens to news for topics of interest and provides me with a digest

I have not deployed the typical mail, calendar, contacts or similar productivity suites, as for now the cost/benefit ratio doesn't seem favorable. I am interested into more niche cases for automation and cloud services.

I was curious, which "unusual" cloud services the HNers have created / are using?