You could go with Lazarus[0]. It is dead simple to use (hope you like Pascal, though) and can use native widgets from your choice of Win32, Cocoa, GTK+ or QT.

You could go with Lazarus[0]. It is dead simple to use (hope you like Pascal, though) and can use native widgets from your choice of Win32, Cocoa, GTK+ or QT. [0] https://www.lazarus-ide.org/ https://www.lazarus-ide.org/