OPS5
This repository contains a Common Lisp implementation of OPS5. It was obtained from the CMU AI Archive on January 16, 2020, and modified by Zachary Beane to build and run on modern (as of 2020) Common Lisp implementations.
The original software and all updates by Zachary Beane are in the public domain.
The original, unchanged README file is available unchanged as README.orig.