Tkcon is a replacement for the standard console that comes with Tk (on
Windows/Mac, but also works on Unix).

The console itself provides many more features than the standard
console. Tkcon works on all platforms where Tcl/Tk is available. It is
meant primarily to help when working with the little details inside Tcl
and Tk, giving Unix users the GUI console provided by default in the
Mac and Windows Tk. It is also not a bad replacement for the default
MS-DOS shell (although it needs lots of fine tuning).