Clozure CL (formerly OpenMCL) is an open source Common Lisp implementation that runs on the following platforms:
* Mac OS X 10.4 and later (PowerPC and x86)
* Linux (PowerPC and x86)
* FreeBSD 6.x and later (x86)
* Solaris (x86)
* Microsoft Windows (x86)
Both 32- and 64-bit binaries are included with all ports.