Clozure Associates is a Lisp consulting company; it sponsors the development of Clozure Common Lisp (CCL).

(Unofficial?) Windows binaries available here. Intel only? On an AMD Athlon XP2500+,

> wx86cl.exe
This CPU doesn't support the SSE2 instruction set
CPU doesn't support required features

Certainly works on my AMD laptop. MacOS X Common Lisp implementation