From Rosetta Code
SBCL is an implementation of Common Lisp. Other implementations of Common Lisp.
Steel Bank Common Lisp (SBCL) is a high performance Common Lisp compiler. It is open source / free software, with a permissive license. In addition to the compiler and runtime system for ANSI Common Lisp, it provides an interactive environment including an a debugger, a statistical profiler, a code coverage tool, and many other extensions.

(from Steel Bank Common Lisp)