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

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

Create context-sensitive return values

https://metacpan.org/release/Contextual-Return

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/

Perl extension for color space conversions and named lookups

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

Indexed colors used by XTerm

https://metacpan.org/release/Convert-Color-XTerm

Perl extension for cookie string generator/parser

http://search.cpan.org/dist/Cookie-Baker/

JSON::XS for Cpanel, fast and correct serialising

http://search.cpan.org/dist/Cpanel-JSON-XS/

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/

Guess OpenSSL include path

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

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

Perl module that provides interoperable MD5-based crypt() function

https://metacpan.org/release/Crypt-PasswdMD5

Perl implementation of the RC4 encryption algorithm

http://search.cpan.org/dist/Crypt-RC4/

Perl implementation of the RC5 encryption algorithm

Perl implementation of the RC6 encryption algorithm

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/

Temporary changing working directory (chdir)

https://metacpan.org/release/Cwd-Guard

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/

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

http://dbi.perl.org

Add contextual fetches to DBI

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

Pure perl persistent multi-level hash/array DBM

https://metacpan.org/release/DBM-Deep

Data::Compare - compare perl data structures

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

Pretty printing of data structures

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

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/

Pack and unpack big-endian IEEE754 floats and doubles

https://metacpan.org/release/Data-IEEE754

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/

Base classes wrapping fundamental Perl data types

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

Colored pretty-print of Perl data structures and objects

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

Read multiple hunks of data out of your DATA section

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

Read data from __DATA__

https://metacpan.org/release/Data-Section-Simple

Generate Globally/Universally Unique Identifiers (GUIDs/UUIDs)

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

Common data validation methods for IPs

https://metacpan.org/release/Data-Validate-IP

Gregorian calendar date calculations

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

Perl5 module containing date manipulation routines

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

Localization support for DateTime

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

Declarative Validation of Perl Data Structures

https://metacpan.org/release/Declare-Constraints-Simple

Figure out the names of variables passed into subroutines

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

Perl module which is meatier versions of caller

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

Check that a command is available

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

Check the compiler availability

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

Check that a library is available

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

Find memory cycles in objects

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