C Language Integrated Production System.
A LogicProgrammingLanguage using ForwardChaining? instead of the BackwardChaining? (BackTracking?) of PrologLanguage. Has sexp syntax (but not entirely lisp-like), and includes an OO system called COOL based on generic methods similar to CLOS.
Most commonly used for expert systems.
Somewhat old and no longer in common use. Successors include Algernon-J (for Java), and Jess (non-free, also for Java).