I built a tool for educators ~7 years ago at my previous employer. That employer shut down and I bought the tool then sold it to my current employer. This year, my employer decided to pivot and we are no longer serving software services. I now have ownership again with multiple clients paying $5k a year for the tool. I was restricted on my time spent on the tool while it belonged to my employer, but now that it's mine again, I can start working on needed improvements and seeking out more clients.

I also have a fairly large YouTube back catalogue of ~1,650 videos. While most of my videos get less than 50 views, I still generate ~$500 a year in AdSense.