CPAN (an acronym for Comprehensive Perl Archive Network) is a large collection of free Perl software and documentation.
One important feature is that all CPAN modules are free of charge, shareware or commercial modules are not allowed in the archive.
The url is http://www.cpan.org; you will find there most of the modules that are available on the net.
If you want to search for a specific module, go to http://search.cpan.org
To report a bug in a module or view the list of bugs, go to http://rt.cpan.org
There are 2 methods to install a module from CPAN:
- Download the "tarball" file and manually uncompress, build and install the module
- Using the CPAN perl module
You can have more detailed installation information in this link