From Rosetta Code
CMUCL is an implementation of Common Lisp. Other implementations of Common Lisp.

Carnegie Mellon University Common Lisp or CMUCL is a Common Lisp implementation developed at Carnegie Mellon University since the early 1980s.[1] CMUCL runs on a variety of platforms[2] and its source code is mostly in the public domain with some parts made available under the FreeBSD license.[3]