GNU CLISP is an ANSI Common Lisp implementation
with an interpreter, compiler, debugger, object
system (CLOS, MOP), sockets, fast bignums, arbitrary precision floats, and a foreign language interface that runs on most Unix variants and Win32.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
Multithreading is mostly usable on most platforms, although officially it is still experimental. clisp.m4 has been added for packages that rely on CLISP to detect the desired version. A few bugs have been fixed.