Oh in the Windos sphere there was Windows Forms, and XAML, and some others thatvI forgot; and html/css based ones (there were some 15+ years ago!); and some oth

Oh in the Windos sphere there was Windows Forms, and XAML, and some others thatvI forgot; and html/css based ones (there were some 15+ years ago!); and some other 'universal' ones like wxWidgets but not open source existed years ago. New ones coming out not so much, no.