CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible. Interpreter, compiler, debugger, CLOS, MOP, FFI, Unicode, sockets, CLX. UI in English, German, French, Spanish, Dutch, Russian, and Danish.
This is Richard C. Waters' SERIES package for Common Lisp. In a nutshell: Think "Efficient MAPCAR" SERIES translates functional-style expressions into efficient loops. Series are to loops as control structures are to GOTOs.