The Comprehensive Perl Archive Network (CPAN) is an archive of over 190 000 modules written in Perl, as well as documentation for it. It is searchable MetaCPAN and accessible from everywhere.
CPAN can denote either the archive network itself, or the module installer (somewhat like a package manager). Other well-known installers are cpanm and cpm).
It’s very personal but if you are after a list of recommended modules, you can start by looking at these: