The titles of these directories are more or less self-eplanatory,
except perhaps for nswc, lsqpack, and numrecipes. 

nswc contains the code of a large numerical mathematics library,
see: 
          NSWC Library of Mathematics Subroutines
          by Alfred H. Morris Jr.
          January 1993 (610 pages)
          Report NSWCDD/TR-92/425
          Naval Surface Warfare Center
          Dahlgren Division
          Dahlgren, VA 22448-5000

lsqpack is the code that goes with the book ... by Lawson and Hanson.

numerecipes is code from Numerical Recipes.

Code in these last three directories has been translated with
f2cl, from the University of Waikato, NZ. Thanks to 
Kevin Broughan (kab@waikato.ac.nz) for code and directions.