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LispWorks - LispWorks is a commercial implementation and IDE for the Common Lisp programming language.
Steel Bank Common Lisp - Steel Bank Common Lisp (SBCL) is a high performance Common Lisp compiler.
Clojure - Clojure is a dynamic, general-purpose programming language, combining the approachability and interactive development of a scripting language with an efficient and robust infrastructure for multithreaded programming.
CLISP - CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible.
Lem - Cross-platform and highly extensible Commo Lisp editor/IDE.
Clozure Common Lisp - Clozure CL (often called CCL for short) is a free Common Lisp implementation with a long history.