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borodi
Fun fact, Julia's parser and part of its compiler are implemented in femtolisp, and you can access it using a not so secret option in the Julia CLI.
danlitt
Interesting! This seems superficially related to GNU Mes[1], although I imagine femtolisp does not require its small source to be written in a "simple" dialect of C.

[1]: https://www.gnu.org/software/mes/

embedding-shape
Slightly unrelated, but you take what (hn item) you can get: What is the smallest lisp (semantically/language-wise) people know, that could be used for implementing itself? Theoretical or practical/"real" is less relevant, mostly just curious. So far, it seems Bel (by pg) might get the closest, but can't claim to be an expert, surely could be something smaller out there?
alethic
Recently, some 9front developers have picked up femtolisp, and are hacking it into something for their own use. https://sr.ht/~ft/StreetLISP/

I believe its adoption was motivated by needing to write/generate an OTF parser.