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And there's nothing special about Tcl the language that makes it special for scripting GUIs -- some people just put in the work to make a cross-platform GUI library and now everyone using Tcl benefits from it. I really wish Go had something similar to Tcl/Tk. I know making a cross-platform GUI library is hard, so how did Tcl/Tk's authors do it? All the way back in 1991, which still works even today?

Sun put money into it in the mid 90s, it was their big cross-platform project before putting everything behind Java.

see https://www.tcl.tk/about/history.html#Sun

Yeah, exactly what I used it for. I used to make small one off gui utilities for my team to use to save time doing certain tasks.

Its easy to develop, surely, but my style feeling hurts how ugly TCL GUI looks like compared to modern GUIs

Given the recent trends in "UX" I would regard that as a a feature though.

Yep, what I've always appreciated most about Tcl is ease of using Tk.

Worst way to make a scripted GUI: dtksh