Perl extension for comparing lists

http://search.cpan.org/dist/List-Compare/

Provide the stuff missing in List::Util

http://search.cpan.org/dist/List-MoreUtils/

Provide compiled List::MoreUtils functions

https://metacpan.org/release/List-MoreUtils-XS

Provide the stuff missing in List::Util

https://metacpan.org/release/List-SomeUtils

XS implementation for List::SomeUtils

https://metacpan.org/release/List-SomeUtils-XS

Perl extension for higher-order list utility functions

https://metacpan.org/release/List-UtilsBy

Two letter codes for state identification in the United States

https://metacpan.org/release/Locale-US

Message handling functions

https://metacpan.org/release/gettext

Internationalization library for Perl

https://metacpan.org/release/libintl-perl

Perl extension to bring loggers and listeners together

http://search.cpan.org/dist/Log-Any/

Suite of OO modules for logging messages to multiple outputs

https://metacpan.org/release/Log-Dispatch

Log events to an array (reference)

https://metacpan.org/release/Log-Dispatch-Array

Log4j implementation for Perl

http://log4perl.sourceforge.net

Provides a unified approach to tracing

https://metacpan.org/release/Log-Trace

Mechanism for returning to a specific point from a deeply nested stack

https://metacpan.org/release/Long-Jump

Many-Core Engine for Perl providing parallel processing capabilities

https://metacpan.org/pod/MCE

Perl5 module for Base32 encodings

http://search.cpan.org/dist/MIME-Base32/

Perl5 module for Base64 and Quoted-Printable encodings

http://search.cpan.org/dist/MIME-Base64/

Charset Informations for MIME

https://metacpan.org/release/MIME-Charset

Deal with RFC 2047 encoded words (improved)

https://metacpan.org/release/MIME-EncWords

A simple interface for creating (not parsing!) MIME messages

http://search.cpan.org/dist/MIME-Lite/

Provide routine to transform a HTML page into a MIME mail

https://metacpan.org/release/MIME-Lite-HTML

Set of perl5 modules for MIME

http://www.zeegee.com/code/perl/MIME-tools/

Perl extension for determining MIME types

http://search.cpan.org/dist/MIME-Types/

Store multi-level hash structure in single level tied hash

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

MLDBM::Sync - safe concurrent access to MLDBM databases

http://search.cpan.org/dist/MLDBM-Sync/

Add mro::* interface compatibility for Perls < 5.9.5

http://search.cpan.org/dist/MRO-Compat/

Object Oriented Authentication-Results Headers

https://metacpan.org/release/Mail-AuthenticationResults

Perl5 module to process and/or create DKIM email

http://jason.long.name/dkimproxy/

Perl5 module to process and/or create DKIM email

https://github.com/msimerson/mail-dmarc

Perl implementation of DomainKeys

http://search.cpan.org/dist/Mail-DomainKeys/

Reference implementation of the RFC 4408 SPF protocol

http://www.openspf.org/

Perl module implementing a simple, platform-independent mailer

http://alma.ch/perl/mail.htm#Mail::Sendmail

Perl5 modules for dealing with Internet e-mail messages

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

Encoding and decoding of base36 strings

http://search.cpan.org/dist/Math-Base36/

Math::BigInt - Arbitrary size integer math package

http://search.cpan.org/dist/Math-BigInt/

Manipulate 64 bits integers in Perl

https://metacpan.org/release/Math-Int64

Perl interface to the ISAAC PRNG Algorithm

https://metacpan.org/release/Math-Random-ISAAC

C implementation of the ISAAC PRNG Algorithm

https://metacpan.org/release/Math-Random-ISAAC-XS

Perl extension for rounding numbers

http://search.cpan.org/dist/Math-Round/

Code shared by the DB reader and writer modules

https://metacpan.org/release/MaxMind-DB-Common

Read MaxMind DB files

https://metacpan.org/release/MaxMind-DB-Reader

MeCab library module for Perl5

https://code.google.com/p/mecab/

Comprehensive, DWIM-featured client to the MetaCPAN API

https://metacpan.org/release/MetaCPAN-Client

Write your linewise code for handles; this does the rest

https://metacpan.org/release/Mixin-Linewise

Build and install Perl modules

http://search.cpan.org/dist/Module-Build/

Tiny replacement for Module::Build

https://metacpan.org/release/Module-Build-Tiny

Module::Build class for building XS modules

https://metacpan.org/release/Module-Build-XSUtil

Generate Kwalitee ratings for a distribution

https://metacpan.org/release/Module-CPANTS-Analyse

Parse cpanfile

https://metacpan.org/release/Module-CPANfile