Clozure CL (formerly known as OpenMCL) is a free Common Lisp implementation. Features include: * A fast, precise, compacting, generational garbage collector written in hand-optimized C. The sizes of the generations are fully configurable. * Full native OS threads on all platforms. The API includes support for shared memory, locking, and blocking for OS operations such as I/O. * Full Unicode support. * Excellent debugging facilities. The names of all local variables are available in a backtrace. * A complete, mature foreign function interface. * Many extensions including: files mapped to Common Lisp vectors for fast file I/O; thread local hash tables and streams to eliminate locking overhead; cons hashing support. WWW: http://www.clozure.com/clozurecl.html