The Apache home page: http://www.apache.org/.
The mod_perl home page: http://perl.apache.org/.
The CPAN home page: http://cpan.org/
CPAN is the Comprehensive Perl Archive Network. Its aim is to contain all the Perl material you will need. The archive is close to a gigabyte in size at the time of this writing, and CPAN is mirrored at more than 100 sites around the world.
The libwww-perl home page: http://www.linpro.no/lwp/.
The libwww-perl distribution is a collection of Perl modules and programs that provide a simple and consistent programming interface (API) to the World Wide Web. The main focus of the library is to provide classes and functions that facilitate writing WWW clients; thus, libwww-perl is said to be a WWW client library. The library also contains modules that are of more general use, as well as some useful programs.