1. MCL
    MCL is Macintosh Common Lisp, a venerable commercial Common Lisp implementation
  2. MCLIDE
    MCLIDE is a free open source Macintosh IDE for Lisp implementations on any platform
  3. MCPat
    MCPat is a meta-circular pattern matching library
  4. McPixel
    McPixel is a McCLIM pixel art editor application
  5. md5
    md5 is a cryptographic Message-Digest algorithm from RSA Data Security, Inc
  6. Measures
    The Measures Package provides dimensioned numbers (i.e
  7. media-types
    Query and compare media types
  8. Medley
    Medley was the last release of the Xerox Lisp environment, before the whole environment was renamed Medley
  9. mel-base
    mel-base is a library for handling email with support for Maildir, POP3, IMAP and SMTP folders
  10. memento-mori
    memento-mori is a library for writing robust, actor-based systems