Future?

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Newbie here. I'm looking for a graphical "form editor" for Python (basically something like Delphi but could be more basic). I'm not constrained by any technology nor anything else except for:

1. portability across systems (macOS/Windows/Linux)
2. easy distribution (ideally one .py file for app source and one .py/.zip file for the whole module with all its dependencies)

gui2py sounds interesting but I'd like to know beforehand whether there are any plans for future development and maintenance? Without that I'd be hesitant to start using gui2py 😢.

Could you elaborate?