One more sketch:

chat.scheme.org/discord/scheme
chat.scheme.org/gitter/gambit
chat.scheme.org/gitter/gerbil
chat.scheme.org/libera/akku
chat.scheme.org/libera/chez
chat.scheme.org/libera/chicken
chat.scheme.org/libera/guile
chat.scheme.org/libera/guix
chat.scheme.org/libera/loko
chat.scheme.org/libera/otus-lisp
chat.scheme.org/libera/owl-lisp
chat.scheme.org/libera/racket
chat.scheme.org/libera/scheme
chat.scheme.org/libera/scsh
chat.scheme.org/web/gauche