Comment by fipar

There are open source ports that have a clear license now: https://github.com/Shen-Language/shen-sources/blob/master/LI...

That said, even if I don't use this a lot, I pay for Shen Professional to support development. Like you, I got and read the book and like the ideas, and I decided to support the project because I rather be sold something explicit (a programming language) than who knows what I get sold through a language that is open source but depends on a few or even one big company to pay the devs.