This member of Knowledge Representation Systems, developed by David E. Young, is currently in Production stage; version 3.2 was released 17 September 2007. LISA is distributed under the terms of the LGPL. The project resides at http://lisa.sourceforge.net.
Lisp Intelligent Software Agents - is a production rule system for Common Lisp. Its purpose is to provide extensive support for the development of intelligent applications, including reasoning-capable software agents. LISA employs a CLOS implementation of Rete and is based on CLIPS and JESS