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.
ClearLisp is a Common Lisp interpreter written in C# with a large library including all of .NET and an extensive object model. Supports IIS and XSP or Apache with mono. Includes sample code of a personal, file based wiki web application.
RefLisp is a small Lisp interpreter written in C++. It has:
an built-in web server, Wiki, LISP server pages, SQL Databases, XML parser, MD5 hashing, regular expressions, reference counting and mark-sweep garbage collection, GPL.