The Axiom computer algebra folks seem to manage well --- I'm pretty sure that's the largest publicly available literate program which is available for inspection.
I've been working to maintain a list of Literate Programs which have been published (as well as books about the process):
Another not on the list is Scheme 9 from Empty Space. I can't speak to its quality though as I've never looked at the resulting book, just perused the stripped source a little a while back.
https://www.t3x.org/s9fes/