There are effectively two Common Lisp worlds: the commercial world where Allegro and Lispworks dominate, and the non-commercial world where SBCL is more or less the only game in town.
CCL, as far as I can tell, is abandonware
Personally, I still try to support CCL, ECL and CLISP in addition to SBCL; I mostly ignore CLISP's warnings though.
ECL still has its niches (if you want to use CL in an Android application, for example, ECL is easier to work with than SBCL).
> CCL, as far as I can tell, is abandonware
Last release was August 14 2024. For a 30+ year old project, that's quite recent methinks.
It clearly doesn't move as fast as SBCL, but I wouldn't call it abandoned either.
ototh, afaiu, SBCL gave up on ARM32. Can't blame them for that, but until 2023 I was still using an early Banana Pi with such. CCL worked there much better (also it's GC seems more robust).