Traditional Chinese Calendar Implementation

https://metacpan.org/release/DateTime-Calendar-Chinese

DateTime Extension for Traditional Japanese Calendars

https://metacpan.org/release/DateTime-Calendar-Japanese

DateTime Extension for Japanese Eras

https://metacpan.org/release/DateTime-Calendar-Japanese-Era

Mayan Long Count, Haab, and Tzolkin calendars

http://datetime.perl.org/

DateTime Extension for Calculating Important Chinese Dates

https://metacpan.org/release/DateTime-Event-Chinese

DateTime Objects for sunrise and sunset for a given day

https://metacpan.org/release/DateTime-Event-Sunrise

Create DateTime parser classes and objects

https://metacpan.org/release/DateTime-Format-Builder

Parse ISO8601 formats

https://metacpan.org/release/DateTime-Format-ISO8601

Japanese DateTime Formatter

https://metacpan.org/release/DateTime-Format-Japanese

Convert between DateTime and RFC2822/822 formats

http://datetime.perl.org/

Parse and format MySQL dates and times

https://metacpan.org/release/DateTime-Format-MySQL

Parse and format PostgreSQL dates and times

https://metacpan.org/release/DateTime-Format-Pg

Parse and format SQLite dates and times

https://metacpan.org/release/DateTime-Format-SQLite

Parse and format strp and strf time patterns

https://metacpan.org/release/DateTime-Format-Strptime

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

Datetime sets and set math

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

Time zone object base class and factory

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

DateTime Calculation Utilities

https://metacpan.org/release/DateTime-Util-Calc

Declarative Validation of Perl Data Structures

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

Figure out the names of variables passed into subroutines

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

Custom op checking attached to subroutines

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

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

Adding keywords to Perl, in Perl

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

Expose PL_dirty, the flag which marks global destruction

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

Perl module which does alias lexical variables

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

Perl Memory Analysis Tool

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

Write a heap dump file for later analysis

https://metacpan.org/release/Devel-MAT-Dumper

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/

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 a fingerprint in "bubble babble" format

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

Perl5 interface to HMAC Message-Digest Algorithms

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

Perl extension for JHash hash algorithm

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

Perl5 interface to the MD5 algorithm

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

Perl extension for MD5 hash algorithm in pure Perl

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

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

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