>> So it's hard for me to recommend tk for GUI development. Tcl/Tk is widely used in lightweight legacy GUIs. Python distributions will typically include tkin

>> So it's hard for me to recommend tk for GUI development. Tcl/Tk is widely used in lightweight legacy GUIs. Python distributions will typically include tkinter (https://docs.python.org/3/library/tkinter.html https://docs.python.org/3/library/tkinter.html) which is just a Python wrapper for Tk. Git usually includes the gitk graphical utility which is written in Tcl/TK: https://github.com/git/git/blob/master/gitk-git/gitk https://github.com/git/git/blob/master/gitk-git/gitk It's probably in use in other places, but those are two that quickly come to mind. I agree that Tcl/Tk is probably not an ideal choice for new projects, but it has a long legacy, is quite stable and likely to be around, largely unchanged, for some time to come.