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/

Generate world unique message-ids

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

Email::Send - Simply Sending Email

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

Simple parsing of RFC2822 message format and headers

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

Provides interfaces between strings and the rest of the system

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

Encode::Encoding subclass that detects the encoding of data

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

Determine the locale encoding

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

Perl module to provide Error/exception support for perl: Error

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

A module that allows you to declare real exception classes in Perl

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

Compile and link C code for Perl modules

https://metacpan.org/release/ExtUtils-CBuilder

Designed to write a Makefile for an extension module

http://search.cpan.org/dist/ExtUtils-MakeMaker/

Converts Perl XS code into C code

https://metacpan.org/release/ExtUtils-ParseXS

Modules for perl5, for enabling FastCGI support in CGI scripts

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

Perl extension for recursively copying files and directories

http://search.cpan.org/dist/File-Copy-Recursive/

Get home directory for self or other users

http://search.cpan.org/dist/File-HomeDir/

Parse directory listings

http://search.cpan.org/dist/File-Listing/

File::NFSLock - perl module to do NFS (or not) locking

http://search.cpan.org/dist/File-NFSLock/

Perl5 module to easily removes files and directories

http://search.cpan.org/dist/File-Remove/

Locate per-dist and per-module shared files

http://search.cpan.org/dist/File-ShareDir/

Perl Module to read the end of a file as it\x27s appended to

http://search.cpan.org/dist/File-Tail/

Perl5 module to generate temporary files or directories safely

http://search.cpan.org/dist/File-Temp/

Portable implementation of which(1) in Perl

http://search.cpan.org/dist/File-Which/

Number of source filters for perl5 programs

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

Perl extension providing access to the GSSAPIv2 library

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

Handle ISO-3166 country codes

http://search.cpan.org/dist/Geography-Countries/

Perl module for processing argument vectors

https://metacpan.org/release/Getopt-ArgvFile

Perl module for extended processing of command line options

Graph, the Perl module for graph operations

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

Module to produce HTML 'breadcrumb trails'

http://search.cpan.org/dist/HTML-Breadcrumbs/

Determine the encoding of HTML/XML/XHTML documents

http://search.cpan.org/dist/HTML-Encoding/

High-performance, dynamic web site authoring system

http://search.cpan.org/dist/HTML-Mason/

Perl module for handling CGI HTML paging of arbitrary data

http://search.cpan.org/dist/HTML-Pager/