1881. Markus Fix
      Markus Fix, an instance of class Person, grew up in Africa
1882. Martin Atzmueller
      Martin Atzmueller is a Person
1883. Martin Dengler
      Martin Dengler is a python programmer in London
1884. MartySchrader
      Just a curious visitor
1885. Mason Smith
      I, Mason Smith, am a person
1886. Massimiliano Campagnoli
      I am currently re-implementing in Lisp the C++ ERP application used in the company I work for
1887. math-extensions
      Additional numerical classes (quaternions, intervals, etc.) for Common Lisp
1888. Mathematics
      Mathematics Library and Application packages
1889. MatLisp
      A BLAS and LAPACK linear algebra library wrapper which makes their features accessible through a set of CLOS classes
1890. matrix
      See linear algebra

CLiki the common lisp wiki