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CMUCL is a high-performance, free Common Lisp implementation which runs on most major Unix platforms.

CL-SMTP is a simple lisp smtp client. It works in ACL, SBCL, CMUCL, OPENMCL, LISPWORKS, CLISP and ECL.

Another System Definition Facility — de facto standard build system for Common Lisp software. Includes UIOP, the Utilities for Implementation- and OS- Portability, a library to make possible the portable development of CL software.