Creative ways to monetize personal code if it's not an "app"

Let's go straight to the sauce! How do you monetize your personal code if it doesn’t really fit into a classic product or SaaS model?

Here few options

* Train ML model that solves a niche task really well — but turning it into a full-blown app seems like overkill.

* Write a CLI tool that processes log files better than anything else I’ve found, but it’s too specialized to justify making a company out of it.

* Build a few small functions in different languages (Python, Go, Rust) that do neat things — data cleanup, API scraping, PDF generation — but none of them are “products” by themselves.

Has anyone here has tried something similar — or if you’ve seen creative ways to turn technical tools or utilities into sustainable side income, please do share it below.

Your ideas and examples are more than welcome!