Hi,

A quick search got me this:

https://github.com/DalekBaldwin/on-lisp/blob/master/on-lisp.asd

So it seems that the license is an informal

> As long as you tell people it's modified and link to the original,
> that's fine.  --pg

Not sure what to make of it.

I've heard of a few libraries that implement some "On Lisp" algorithms,
but I suppose we would need to look in details.

Maybe ask on r/lisp or r/common_lisp.

-- 
Pierre Neidhardt
https://ambrevar.xyz/