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I was at a presentation on LOOPS in London given by Dan Bobrow and Mark Stefik, they were pitching it as an equivalent framework to KEE or ART as you describe. They had a good showcase application called Truckin' [1] that made good use of all the features of LOOPS.

[1] https://www.markstefik.com/?page_id=359

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Yes!, that Truckin’ demo was awesome. I had a 1108 Xeorx Lisp Machine, and ran InterLisp-D on it the first 18 months I had it, then switched to running Common Lisp. Such a fantastic development environment!

Some more background https://larrymasinter.net/stefik-loops.pdf and https://www.markstefik.com/?page_id=334

I think LOOPS was limited by only being available on Interlisp-D related systems. Common LOOPS was supposed to be portable, but I remember it only in the context of the CLOS development as a stepping stone, but not as a product or environment like LOOPS.

I ran Common LOOPS in AKCL on a 386 PC. It was just an object system for programming, it didn't have a Frame System or Rule Engine as well like LOOPS.

My previous environment had been Franz Lisp on the Atari ST. My copy of the Franz sources was missing flavors so I wrote my own object system for it that looked a bit like New Flavors but with a frame system built in as well. My binding to GEM from Lisp made use of the object system as well and the repl was in a GEM window.

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