The CPAN is the world's distributed, replicated repository of Perl utilities. Unless noted otherwise, you can find everything in this column on the CPAN. Visit Tom Christiansen's multiplexer to be redirected to a CPAN site near you:

You'll be able to find the modules under the author's name, at http://www.perl.com/CPAN/modules/by-authors.

http://www.perl.com/CPAN/modules/INSTALL.html has instructions on how to build modules on all major operating systems.

You can also use Andreas König's CPAN module to automatically install modules. Once you've installed it, perl -MCPAN -e 'install(" modulename")' will automatically download, build, and install the module for you.