Been around for a long time indeed. I first learned literate programming in college at Tufts, from Norman Ramsey. He wrote noweb[1], an early implementation of Knuth's ideas.
(The username being `partingr` suggests it was some time late 92 to mid 95 whilst I was at cs.man.ac.uk)
https://github.com/nrnrnr/noweb/tree/master/contrib/partingr
I don't remember why I selected nuweb, other than it worked with any language, but it looks like it was inspired by noweb. I had learned about literate programming from studying TeX.