Well, Delphi is well alive and current:
https://www.embarcadero.com/products/delphi
(it have a free edition) and alzo exist Lazarus, a open source clone:
https://www.lazarus-ide.org
Is probably the most fleshed idea under more "traditional" paradigms (OOP, RAD, etc)
Smalltalk and others are less popular(?) and only know them passing, so can't give too much of that.
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Another interesting stuff can be rebel/red:
https://www.red-lang.org
much low-level but nice way to do UIs in a apparent declarative way..