CCL
CCL is the Clozure Common Lisp implementation. Its most recent release is version 1.9, available since 2013-03-07. It used to be called OpenMCL. CCL runs on Mac OS X (ppc and x86), Linux (ppc and x86), FreeBSD (x86), Solaris (x86), and Windows XP and later (x86), and is available in 32 and 64-bit versions on all platforms. Some distinguishing features of the implementation include fast compilation speed, native OS threads, a precise, generational, compacting garbage collector, and a convenient foreign-function interface.

License: LLGPL

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