Mine is a side business: https://panelbear.com/

I started building it for myself at first, scratching my own itch.

I don’t feel the same pressure as I had with my open source projects. I’ve been adding features when I feel the need for my own use (i.e. alerting system), or customers made a good point for why it’d be useful.

Also, I don’t work on stuff that nobody requested yet. For example, you can’t even change your account email yet.

So far it’s been fun working on it, and slowly getting paying customers. But it might take 1-2 years for it to replace my day job income-wise. That’s fine, it’s just about having the right expectations, and keeping up a sustainable pace.