Lisp is for building organisms - imposing, breathtaking, dynamic structures built by squads fitting fluctuating myriads of simpler organisms into place.
– Alan J. Perils in SICP
SBCL (based on the earlier CMUCL) is a “high performance compiler and runtime system for ANSI Common Lisp, it provides an interactive environment including a debugger, a statistical profiler, a code coverage tool, and many other extensions.”
Clozure CL aka. CCL “is a free Common Lisp implementation with a long history. Some distinguishing features of the implementation include fast compilation speed, native threads, a precise, generational, compacting garbage collector, and a convenient foreign-function interface.” for x86, x86-64, ppc32, ppc64, armv7l/armv6
Wilbur is Nokia Research Center's toolkit for programming Semantic Web applications that use RDF and DAML+OIL (and XML) http://wilbur-rdf.sourceforge.net/
the CLiki reference/discsussion site. “This site intends to provide a collection of links to and resources for free software implemented in Common Lisp and available on Unix-like systems. Listed software should satisfy the DFSG.” http://ww.telent.net/cliki/