as per wiki, several gui apps use guile as scripting language.
also guix of interest.
if emacs would have guile, i would have single language lisp machine.
emacs lisp is not standard, while guile R7RS. so even more sharing.
so for me emacs with guile, were people during rewrites improved emacs extetensions, and i can do all in guile, music taxes money debugging productivity all in guile. is very attractive.
https://www.gnu.org/software/guile/#apps-using-guile
''Guile is used in many programs under the GNU project umbrella (GDB, Make, Guix, GNU TeXmacs, GnuCash, LilyPond, Lepton-EDA...)[8] but it also sees use outside of that, for example in Google's schism.''
also seems guile is jit, emacs lisp interpreted.
and guile favors immutable, unlike emacs lisp. which i favor too.
there is also guile hoot giving me option for browser.