Programmable DNS resolver for off-line testing

http://search.cpan.org/dist/Net-DNS-Resolver-Programmable/

Perl extension for simplifying FTP file operations

https://metacpan.org/release/Net-FTP-File

Low-level HTTP client

http://search.cpan.org/dist/Net-HTTP/

Internationalizing Domain Names in Applications (RFC 3490)

https://metacpan.org/release/Net-IDN-Encode

Perl extension for manipulating IPv4/IPv6 addresses

http://search.cpan.org/dist/Net-IP/

This module provides access to the libidn library

https://metacpan.org/release/Net-LibIDN

Libdnet interface

http://search.cpan.org/dist/Net-Libdnet/

Perl module to parse, manipulate, and lookup IP network blocks

https://metacpan.org/release/Net-Netmask

Perl module to interact with RabbitMQ over AMQP using librabbitmq

https://metacpan.org/release/Net--RabbitMQ

An SMTP client supporting SSL

http://search.cpan.org/dist/Net-SMTP-SSL/

Object oriented interface to SNMP

https://metacpan.org/release/Net-SNMP

Perl5 interface to SSL

http://search.cpan.org/dist/Net-SSLeay/

Configurable base class for writing internet servers in Perl

http://search.cpan.org/dist/Net-Server/

Perl5 module to access and use telnet protocol

https://metacpan.org/release/Net-Telnet

Net::XMPP provides Perl Developer access to the XMPP protocol

http://search.cpan.org/dist/Net-XMPP/

Whois Client Interface for Perl5

http://search.cpan.org/dist/Net-XWhois/

Perl module for working with IP addresses and blocks thereof

http://search.cpan.org/dist/NetAddr-IP/

Manage newsrc files

https://metacpan.org/release/News-Newsrc

Numeric comparisons

https://metacpan.org/release/Number-Compare

Perl module for OLE document interface

http://search.cpan.org/dist/OLE-Storage_Lite/

More Opcodes information from opnames.h and opcode.h

https://metacpan.org/release/Opcodes

Create and manipulate PAR distributions

http://search.cpan.org/dist/PAR-Dist/

Facilitates the creation and modification of PDF files

https://metacpan.org/release/PDF-API2

Optional PDF::API2 add-on using XS to speed up expensive operations

https://metacpan.org/release/PDF-API2-XS

Perl extension for glibc compatible strftime for loggers/servers

http://search.cpan.org/dist/POSIX-strftime-Compiler/

Perl interface to strptime(3)

http://search.cpan.org/dist/POSIX-strptime/

Analyze and manipulate Perl code without using perl itself

http://search.cpan.org/dist/PPI/

Parse Perl string literals and string-literal-like things

https://metacpan.org/release/PPIx-QuoteLike

PPI regular expression parser

http://search.cpan.org/dist/PPIx-Regexp

Extensions to PPI

http://search.cpan.org/dist/PPIx-Utilities/

Utility functions for PPI

https://metacpan.org/release/PPIx-Utils

List all constants declared in a package

http://search.cpan.org/dist/Package-Constants

Manage deprecation warnings for your distribution

http://search.cpan.org/dist/Package-DeprecationManager/

Routines for manipulating stashes

http://search.cpan.org/dist/Package-Stash/

Faster and more correct implementation of the Package::Stash API

http://metacpan.org/release/Package-Stash-XS

Parameterizable packages

http://search.cpan.org/dist/Package-Variant/

PadWalker - play with Perl lexical variables

http://search.cpan.org/dist/PadWalker/

Perl module for layout and render i18n text

https://metacpan.org/release/Pango

Simple parallel processing fork manager

https://metacpan.org/release/Parallel-ForkManager

Argument type classification

https://metacpan.org/release/Params-Classify

Allows your classes to do coercion of parameters (Params::Coerce)

https://metacpan.org/release/Params-Coerce

Utility functions to aid in parameter checking

http://search.cpan.org/dist/Params-Util/

Validate method/function parameters

http://search.cpan.org/dist/Params-Validate/

Build an optimized subroutine parameter validator once, use it forever

https://metacpan.org/release/Params-ValidationCompiler

Parse META.yml and other similar CPAN metadata files

http://search.cpan.org/dist/Parse-CPAN-Meta/

A recursive descent parsing framework for Perl

http://search.cpan.org/dist/Parse-RecDescent/

Perl5 routines that present a simple interface to parse syslog files

http://search.cpan.org/dist/Parse-Syslog/

Perl extension for generating and using LALR parsers

https://metacpan.org/release/Parse-Yapp

Perl module with utilities to read and manipulate patches and CVS

http://search.cpan.org/dist/PatchReader/

Cross-platform path specification manipulation

http://search.cpan.org/dist/Path-Class/