This is a tough question. Is there any chance to build a web app on top of the library which people would use? This could be a way to monetize, although I don'

This is a tough question. Is there any chance to build a web app on top of the library which people would use? This could be a way to monetize, although I don't see ICs using such a tool. Another way could be consulting/service based on your library. Let's say the library produces results and you can sell these results as a report to the company. The boundaries between consulting and service in such cases are quite fluid in my opinion. Anyway, as others have mentioned, selling libraries to ICs is hard. Most work on their own stuff that fits their needs. Coding is also a way to understand and to build up intuition about things, so not sure. I would actually go talk to a few people you think you could sell to at some time and figure out what they think about using such a lib.