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I used to love programming in the Macintosh Common Lisp environment. When the Mac moved to the PowerPC architecture there was a gap. Also at that time nouvelle

I used to love programming in the Macintosh Common Lisp environment. When the Mac moved to the PowerPC architecture there was a gap. Also at that time nouvelle AI labs moved to the PC architecture for access to embodied systems (robotics). Unfortunately on PC Allegro Common Lisp seemed the only viable option. I still think it could have been a great success, but the company pursued a business model at the time with hideously expensive licenses (the intrusive phone sales campaigns didn't help their popularity either). By the time the Lisp ecosystem recovered, many had moved on.

lispm 4y ago
MCL also moved to the PowerPC architecture. But it was later lost when there was the move to Mac OS X and Intel. The Open Source variant Clozure CL lacked the commercial backing and the nice IDE. Today the only really good GUI-based Lisp for macOS is LispWorks, which is expensive - but it is available on the latest macOS and the latest hardware. Clozure CL struggles to find maintainers. The PC with Windows had Allegro CL, Golden Common Lisp, Corman Lisp and LispWorks. Of those Allegro CL and LispWorks are still available, though expensive.