What is "openlisp"

OpenLisp is a programming language in the LISP family developed by Christian Jullien. It conforms to ISLISP International Standard, ISO/IEC 13816:1997(E) revised by ISO/IEC 13816:2007(E), published by ISO.

Written in C and Lisp, it runs on most common operating systems. OpenLisp is designated an ISLISP implementation, but also contains many Common Lisp-compatible extensions (hashtable, readtable, package, defstruct, sequences, rational numbers) as well as other libraries ( network socket, regular expression, XML, Posix, SQL, LDAP).

OpenLisp includes an interpreter associated to a REPL, a Lisp Assembly Program (LAP) and a C backend compiler.