The actual artifacts live here:The LM-3 project has announced version 100, the last ever release of the system software for the MIT CADR Lisp Machine. So, both a new release and a very old one all at once.
News of this release came yesterday in a LinkedIn post by IBM's Eric Moore, who helped in the recovery effort. A more detailed post from the restoration project describes what the software is, and from where it was recovered.
https://tumbleweed.nu/lm-3/