I release it as open source and include it in my resume/portfolio. This has helped me get lucrative jobs. The resulting increased income is likely more than I w

I release it as open source and include it in my resume/portfolio. This has helped me get lucrative jobs. The resulting increased income is likely more than I would have earned selling these small projects by multiple orders of magnitude. Of course, if I were making software with a wide market fit, or a very valuable narrow market fit, I would strongly consider starting a business. But my personal code generally solves very niche problems.