ISLisp
ISLisp is a standardized Lisp dialect defined by ISO/IEC 13816:2007(E) that attempts to standardize on features common to Common Lisp, EuLisp, Le Lisp, and Scheme.

More information on ISLisp is available at http://www.islisp.info/

The ISLisp specification is available from http://www.islisp.info/specification.html

There are several ISLisp implementations: