Tcl/tk snippets, integrated with Repl.it
Tcl support is new in Repl.it as of July 2020, and the language does not appear in some of the website comboboxes for creating a new Repl. Actually, the .replit file can have its run setting value set either for tclsh or wish. Running wish will show a remote, tiny X window.
Anyway, the chosen interpreter will have to have one single .tcl file indicated to be run.