Right now, I just have one business that makes money. It's an ingredient parsing API that I wrote in 2018.[0] It was not a good idea, but it still makes $100-200/mo without me doing anything. Until a few months ago, I also had a website about the keto diet that made about $100/mo, but I sold it because I wasn't doing anything with it.[1]
I'm currently working on a book about writing as a developer, and that's my main focus for the next few months,, but I don't know if I' call it a business because I haven't sold anything yet.[2]
[0] https://zestfuldata.com/
[1] https://mtlynch.io/notes/buy-is-it-keto/
[2] https://refactoringenglish.com