Getopt::Euclid is a Perl module that uses your program's own documentation to create a command-line argument parser. This ensures that your program's documented interface and its actual interface always agree. Only development code is hosted on this Sourceforge webpage. Download releases of Getopt::Euclid from CPAN: http://search.cpan.org/dist/Getopt-Euclid/
Perl OO extension to ease creation of structured data output (html tables, csv files, excel spreadsheets, etc)
Statistics modules in Perl Data Language, with a quick-start guide for non-PDL people. They make the PDL shell work like R, but with PDL threading (fast automatic iteration) of procedures including t-test, linear regression, and k-means clustering.