The whole point of my comment was " Lisp environments that resemble in any way the old Lisp Machine or Xerox PARC ones".

These development environments just were IDEs written in Lisp, otherwise they most don't have to do much with those Lisp Machine IDEs.

Most Common Lisp IDEs had a collection of these tools: Editor, Listener, Inspector, Debugger, Stepper, Preferences, ... Additionally there were various browsers, an interface builder, profiler, ...

The Lisp Machine IDEs had most of these tools, too. But they weren't only styled for development, but also for general use. Thus a Lisp Listener was not only a REPL, but also a general command line interface to interact with the machine. They were also more oriented towards group work and had additional features like versioned file systems, software versioning systems, databases, support for multiple programming languages (like C, Pascal, Ada, Fortran, Prolog, ...), source repositories, ...

Over the years (80s onwards) a multitude of these IDEs on Workstations and PCs were developed. CMUCL comes with one for X11 (debugger, editor, ...), Macintosh Common Lisp, ExperLisp, Procyon Common Lisp had one for Macs and Windows, Golden Common Lisp had one for Windows, Corman Lisp for Windows, SPE from SUN, Lucid CL had one (called XLT, their editor was called Helix), Star Sapphire Common LISP had one, Clozure CL has one for macOS (which one can run on a current Mac), ...

Then there were always IDEs based on GNU Emacs or XEmacs. Ilisp was once popular, Allegro CL has ELI, SLIME currently is the most popular with Sly as a fork. This is not so bad, since there are decent versions of GNU Emacs for Windows, Unix/GTk+ and macOS.

Of the commercial ones only Allegro CL (IDE for Windows and Unix/GTk+) and LispWorks (IDE Windows, Unix/Gtk+, deprecated for Unix/Motif, macOS) survived with regular releases.

Of the non-commercial ones SLIME/GNU Emacs is the most popular and it is also used by some users of Allegro CL and LispWorks. McCLIM lingers in the background with a collection of tools which would make an IDE, but it lacks one or more better GUI backends.

There are also a bunch of other ways to use Common Lisp with other editors (vim, atom, ...).

Now 'darkmatter' is another one. Let's see what people think from using it...

Very nice overview, always a pleasure to learn from your real life Lisp experience in the original Lisp environments.

I got mine from endless hours reading the manuals, books and papers from those days, so I sometimes miss a few details.

> McCLIM lingers in the background with a collection of tools which would make an IDE, but it lacks one or more better GUI backends.

Worth noting that McCLIM is again under active open-source development, so there are hopes for a decent GUI backend here.