IntelligentPad (1989): a component-based drag-and-drop software creator
blog.gingerbeardman.com
blog.gingerbeardman.com
I'd never heard of it before but you can easily see the things it has in common with Interface Builder (which was new at the time), Hypercard (ditto) and even things that followed it like Fujitsu's TownsGEAR, Microsoft's Visual Basic, Borland's Delphi and Apple Research Lab's Squeak.
I also find it somewhat frightening how quickly good ideas are jettisoned in the name of "progress" when the new thing is provably worse than the thing it replaces. Apple have done this so many times recently with things in macOS and perhaps even with Swift.
another similar environment that 20 years ago I thought would become the new desktop/programming metaphor is vvvv[0]
vvvv looks cool, it's just a shame they promote the output (views of exhibitions etc) rather than the tool itself. I tried to find information and screenshots of it, but failed and gave up.
however there used to be screenshots[0]! always praise be to the wayback machine
ah and there is also a javascript version[1]!
apparently they've also changed the colours of the environment, it used to be in light shades of grey now it looks all dark mode (which I personally detest and find illegible)
[0]http://web.archive.org/web/20170111184727/https://vvvv.org/s...