Guile is great, but I think outside Guix it's pretty niche. Racket is probably the most frequent choice. But I really like some aspects of Chicken, Gambit and

Guile is great, but I think outside Guix it's pretty niche. Racket is probably the most frequent choice. But I really like some aspects of Chicken, Gambit and Bigloo. Even Clojure or CL could also be used, with a bit of friction of course.