This article completely ignores the Macintosh and the greatest IDE ever, which came out in in the mid-80s: Coral Common Lisp. It ran on a Mac Plus with 1MB of RAM and it was fucking awesome. It included a drag-and-drop interface builder that let you build a complete app in literally a matter of minutes. Nothing I've seen has come close since.
The descendant of CCL runs on modern Intel Macs. (It also runs on Linux and Windows but without the IDE.) The modern IDE is quite a bit different from the original. In particular, it no longer has the interface builder. But it's still pretty good. It is now called Clozure Common Lisp (so the acronym is still CCL) and you can find it here:
If you want to run the original that is a bit of a challenge, but still possible. The original was never ported directly to OS X so you have to run it either on old hardware or an emulator running some version of the original MacOS, or on an older Mac running Rosetta 1. In the latter case you will want to look for something called RMCL. Also be aware that Coral Common Lisp was renamed Macintosh Common Lisp (i.e. MCL) before it became Clozure Common Lisp (CCL again).
This looks like it might be a promising place to start:
