Read/Write .ini style files with as little code as possible

https://metacpan.org/release/Config-Tiny

Run code after a subroutine call, preserving the context the subroutine

https://metacpan.org/release/Context-Preserve

Perl5 module to encode and decode ASN.1 data structures

https://metacpan.org/release/Convert-ASN1

Perl module to extract data from Macintosh BinHex files

https://metacpan.org/release/Convert-BinHex

Perl5 interface to Cipher Block Chaining with DES and IDEA

https://metacpan.org/release/Crypt-CBC

Perl5 interface to DES block cipher

https://metacpan.org/release/Crypt-DES

OpenSSL's multiprecision integer arithmetic

https://metacpan.org/release/Crypt-OpenSSL-Bignum

Perl5 module to RSA encode and decode strings using OpenSSL

https://metacpan.org/release/Crypt-OpenSSL-RSA

Perl5 interface to the OpenSSL pseudo-random number generator

Perl5 interface to allow p5-libwww LWP to make https connections

https://metacpan.org/release/Crypt-SSLeay

Perl module implementing lanman and nt md4 hash functions

https://metacpan.org/release/Crypt-SmbHash

Provides access to PostgreSQL databases through the DBI

https://metacpan.org/release/DBD-Pg

Provides access to SQLite3 databases through the DBI

https://metacpan.org/release/DBD-SQLite

MySQL driver for the Perl5 Database Interface (DBI)

https://metacpan.org/release/DBD-mysql

MySQL 5.1 driver for the Perl5 Database Interface (DBI)

http://search.cpan.org/dist/DBD-mysql/

MySQL 5.5 driver for the Perl5 Database Interface (DBI)

http://search.cpan.org/dist/DBD-mysql/

Perl5 Database Interface, required for DBD::* modules

https://metacpan.org/release/DBI

Extensible and flexible object <-> relational mapper

https://metacpan.org/release/DBIx-Class

Add contextual fetches to DBI

https://metacpan.org/release/DBIx-ContextualFetch

Stringified perl data structures, suitable for both printing and eval

https://metacpan.org/release/Data-Dumper

Less indentation and newlines plus sub deparsing

http://search.cpan.org/dist/Data-Dumper-Concise/

Data::JavaScript - Dump perl structures to JavaScript code

https://metacpan.org/release/Data-JavaScript

Parse and validate simple name/value option pairs

https://metacpan.org/release/Data-OptList

Pager utility for Class::DBI

https://metacpan.org/release/Data-Page

Gregorian calendar date calculations

https://metacpan.org/pod/Date::Calc

Perl5 module containing date manipulation routines

https://metacpan.org/release/Date-Manip

Date and time object

https://metacpan.org/release/DateTime

Convert between DateTime and RFC2822/822 formats

http://datetime.perl.org/

Parse and format W3CDTF datetime strings

http://datetime.perl.org/

Create DateTime objects with sub-second current time resolution

https://metacpan.org/release/DateTime-HiRes

Localization support for DateTime

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

Time zone object base class and factory

https://metacpan.org/release/DateTime-TimeZone

Figure out the names of variables passed into subroutines

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

Stack trace and stack trace frame objects

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

Perl5 module that dumps symbol names or the symbol table

https://metacpan.org/release/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)

https://metacpan.org/release/Device-Modem

Perl5 module for simple serial port control

https://metacpan.org/release/Device-SerialPort

Modules that calculate message digests

https://metacpan.org/release/Digest

Perl5 interface to HMAC Message-Digest Algorithms

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

Perl5 interface to the MD5 algorithm

https://metacpan.org/release/Digest-MD5

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

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

Perl interface to the SHA-1 Algorithm

Declare version conflicts for your dist

https://metacpan.org/release/Dist-CheckConflicts

RFC 2822 Address Parsing and Creation

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

Produce RFC 2822 date strings

https://metacpan.org/release/Email-Date-Format

Easy MIME message parsing

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

Parse a MIME Content-Type Header

https://metacpan.org/release/Email-MIME-ContentType

Unified interface to MIME encoding and decoding

https://metacpan.org/release/Email-MIME-Encodings

Modify Email::MIME Objects Easily

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