Ask HN: How to monetize side projects without marketing?

I love building things and have a good bit of money invested, such that if I could just earn 30-40k per year from my side projects I could live comfortably.

I hate marketing though. I'm sure this sounds familiar...

Is there any way to make money from a "side project" or open source development without needing to do marketing campaigns?

Not only am I terrible at it, even thinking about it corrupts my enjoyment of developing new stuff.