1911. MCLIDE
      MCLIDE is a free open source Macintosh IDE for Lisp implementations on any platform
1912. MCPat
      MCPat is a meta-circular pattern matching library
1913. McPixel
      McPixel is a McCLIM pixel art editor application
1914. md5
      md5 is a cryptographic Message-Digest algorithm from RSA Data Security, Inc
1915. Measures
      The Measures Package provides dimensioned numbers (i.e
1916. media-types
      Query and compare media types
1917. Medley
      Medley was the last release of the Xerox Lisp environment, before the whole environment was renamed Medley
1918. mel-base
      mel-base is a library for handling email with support for Maildir, POP3, IMAP and SMTP folders
1919. memento-mori
      memento-mori is a library for writing robust, actor-based systems
1920. memeozi
      (memeozi) is a library for memoization of functions

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