RefLisp
A small Lisp interpreter written in C++ by Bill Birch of Bull, UK. RefLisp has a built-in web server, Wiki, LISP server pages, SQL Databases, XML parser, MD5 hashing, regular expressions, reference counting and mark-sweep garbage collection.
RefLisp has shallow-binding and dynamic scope with optional support for lexical scope, Common Lisp compatibility and for indefinite extent Scheme programs.