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

http://search.cpan.org/dist/Config-Tiny/

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

http://search.cpan.org/dist/Context-Preserve/

Perl5 module to encode and decode ASN.1 data structures

http://search.cpan.org/dist/Convert-ASN1/

Perl module to extract data from Macintosh BinHex files

http://search.cpan.org/dist/Convert-BinHex/

Perl5 interface to Cipher Block Chaining with DES and IDEA

http://search.cpan.org/dist/Crypt-CBC/

Perl5 interface to DES block cipher

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

OpenSSL's multiprecision integer arithmetic

http://search.cpan.org/dist/Crypt-OpenSSL-Bignum/

Perl5 module to RSA encode and decode strings using OpenSSL

http://search.cpan.org/dist/Crypt-OpenSSL-RSA/

Perl5 interface to the OpenSSL pseudo-random number generator

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

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

Perl module implementing lanman and nt md4 hash functions

http://search.cpan.org/dist/Crypt-SmbHash/

Provides access to PostgreSQL databases through the DBI

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

Provides access to SQLite3 databases through the DBI

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

MySQL driver for the Perl5 Database Interface (DBI)

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

The perl5 Database Interface. Required for DBD::* modules

http://dbi.perl.org

Extensible and flexible object <-> relational mapper

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

Add contextual fetches to DBI

http://search.cpan.org/dist/DBIx-ContextualFetch/

Stringified perl data structures, suitable for both printing and eval

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

http://search.cpan.org/dist/Data-JavaScript/

Parse and validate simple name/value option pairs

http://search.cpan.org/dist/Data-OptList/

Module for paging thru result sets

http://search.cpan.org/dist/Data-Page/

Gregorian calendar date calculations

http://www.engelschall.com/u/sb/download/

Perl5 module containing date manipulation routines

http://search.cpan.org/dist/Date-Manip/

Date and time object

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

http://datetime.perl.org/

Localization support for DateTime

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

Time zone object base class and factory

http://datetime.perl.org/

Figure out the names of variables passed into subroutines

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

Stack trace and stack trace frame objects

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

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/

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 HMAC Message-Digest Algorithms

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

Perl5 interface to the MD5 algorithm

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

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

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

Perl interface to the SHA-1 Algorithm

Declare version conflicts for your dist

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

RFC 2822 Address Parsing and Creation

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

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/

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/