There's also a Ruby/Tk, and there used to be a Guile Tk (best frenemies!), but Guile Tk was deprecated and replaced with Guile GTK, which was then replaced with Guile Gnome.

It's pretty funny that although Python has to a large degree replaced Tcl out there, any system that includes a full Python also includes Tcl/Tk, because tkinter depends on Tcl/Tk and is part of Python stdlib.

Even funnier, the proudest project of the Guile world, Guix, depends on Python (via graphviz via glib) and therefore Tcl.