Introspect overloaded operators

https://metacpan.org/release/Devel-OverloadInfo

Partial dumping of data structures, optimized for argument printing

https://metacpan.org/release/Devel-PartialDump

Obtain the REFCNT value of a referent

https://metacpan.org/release/Devel-Refcount

Perl extension for finding the memory usage of Perl variables

https://metacpan.org/release/Devel-Size

Stack trace and stack trace frame objects

http://search.cpan.org/dist/Devel-StackTrace/

Perl extension to display stack trace in HTML

http://search.cpan.org/dist/Devel-StackTrace-AsHTML/

A perl5 module that dumps symbol names or the symbol table

http://search.cpan.org/dist/Devel-Symdump/

Perl interface to GSM phones/modems on serial ports

http://search.cpan.org/dist/Device-Gsm/

Perl class to interface generic modems (AT-compliant)

http://search.cpan.org/dist/Device-Modem/

A perl5 module for simple serial port control

http://search.cpan.org/dist/Device-SerialPort/

Modules that calculate message digests

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

Perl5 interface to a fingerprint in "bubble babble" format

https://metacpan.org/release/Digest-BubbleBabble

Perl5 interface to HMAC Message-Digest Algorithms

http://search.cpan.org/dist/Digest-HMAC/

Perl extension for JHash hash algorithm

https://metacpan.org/release/Digest-JHash

Perl5 interface to the MD5 algorithm

http://search.cpan.org/dist/Digest-MD5/

Perl extension for MD5 hash algorithm in pure Perl

http://search.cpan.org/dist/Digest-Perl-MD5/

Perl extension for SHA-1/224/256/384/512

http://search.cpan.org/dist/Digest-SHA/

Perl interface to the SHA-1 Algorithm

Perl extension for SHA-3

https://metacpan.org/pod/Digest::SHA3

__DIR__ constant for the directory your source file is in

https://metacpan.org/release/Dir-Self

Declare version conflicts for your dist

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

Deconstructed dynamic C library loading

https://metacpan.org/release/DynaLoader-Functions

Perl interface to libev, a high performance full-featured event loop

https://metacpan.org/release/EV

Unified interface to mail representations

https://metacpan.org/release/Email-Abstract

RFC 2822 Address Parsing and Creation

http://search.cpan.org/dist/Email-Address/

Parse and format RFC 2822 email addresses and groups

https://metacpan.org/release/Email-Address-XS

Produce RFC 2822 date strings

http://search.cpan.org/dist/Email-Date-Format/

Easy MIME message parsing

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

Parse a MIME Content-Type Header

http://search.cpan.org/dist/Email-MIME-ContentType/

A unified interface to MIME encoding and decoding

http://search.cpan.org/dist/Email-MIME-Encodings/

Modify Email::MIME Objects Easily

http://search.cpan.org/dist/Email-MIME-Modifier/

Generate world unique message-ids

http://search.cpan.org/dist/Email-MessageID/

Read e-mail messages stored as .msg files

https://metacpan.org/release/Email-Outlook-Message

Email::Send - Simply Sending Email

http://search.cpan.org/dist/Email-Send/

Library for sending email

https://metacpan.org/release/Email-Sender

Simple parsing of RFC2822 message format and headers

http://search.cpan.org/dist/Email-Simple/

More casual approach to creating and sending Email

https://metacpan.org/release/Email-Stuffer

Provides interfaces between strings and the rest of the system

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

Enhanced Chinese encodings with Simplified-Traditional auto-mapping

https://metacpan.org/release/Encode-CNMap

Encode::Encoding subclass that detects the encoding of data

http://search.cpan.org/dist/Encode-Detect/

Charset detector for East Asia charsets and website contents

https://metacpan.org/release/Encode-Detect-CJK

Perl5 module for eucJP-open

https://metacpan.org/release/Unicode-Japanese

Perl5 module defining Microsoft compatible encodings for Japanese

https://metacpan.org/release/Unicode-Japanese

Traditional and Simplified Chinese mappings

https://metacpan.org/release/Encode-HanConvert

Extra sets of Chinese encodings

https://metacpan.org/release/Encode-HanExtra

Perl extension for ISO/IEC 2022 character encoding scheme

https://metacpan.org/release/Encode-ISO2022

JIS X 0212 (aka JIS 2000) Encodings

https://metacpan.org/release/Encode-JIS2K

Perl extension for Emoji encodings and cross-mapping tables

https://metacpan.org/release/Encode-JP-Emoji

Perl extension for encoding for mobile phones in Japan

https://metacpan.org/release/Encode-JP-Mobile

Determine the locale encoding

http://search.cpan.org/dist/Encode-Locale/