Simple data types for common serialisation formats

http://search.cpan.org/dist/Types-Serialiser/

Hack around people calling UNIVERSAL::can() as a function

https://metacpan.org/release/UNIVERSAL-can

Try to recover from people calling UNIVERSAL::isa as a function

https://metacpan.org/release/UNIVERSAL-isa

Moniker for classes

http://search.cpan.org/dist/UNIVERSAL-moniker/

Turns ref() into a multimethod

https://metacpan.org/release/UNIVERSAL-ref

Perl module to require() from a variable

http://search.cpan.org/dist/UNIVERSAL-require/

Perl5 interface to Uniform Resource Identifier (URI) references

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

East Asian Width properties

https://metacpan.org/release/Unicode-EastAsianWidth

Perl class that converts strings to/from 2-byte Unicode UCS2 format

http://search.cpan.org/dist/Unicode-Map/

Mapping table between 8-bit chars and Unicode

http://search.cpan.org/dist/Unicode-Map8/

Perl class that implements conversion between arbitrary charsets

http://search.cpan.org/dist/Unicode-MapUTF8/

Perl extension to turn off UTF-8 flags inside of comprex variable

https://metacpan.org/release/Unicode-RecursiveDowngrade

These are experimental Perl5 modules to handle various Unicode issues

http://search.cpan.org/dist/Unicode-String/

Interface to processor (CPU) information

http://search.cpan.org/dist/Unix-Processors/

Perl extension for centralized input validation for any application

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

Associate user-defined magic to variables from Perl

http://search.cpan.org/dist/Variable-Magic/

Perl binding interface for curl

http://search.cpan.org/dist/WWW-Curl/

Parser and builder for application/x-www-form-urlencoded

https://metacpan.org/release/WWW-Form-UrlEncoded

This module is to help you automate interaction with a website

https://metacpan.org/release/WWW-Mechanize

Database of robots.txt-derived permissions

http://search.cpan.org/dist/WWW-RobotRules/

Generalisation of wantarray

https://metacpan.org/release/Want

Perl module for building DOM Level 1 compliant document structures

http://search.cpan.org/dist/XML-DOM/

Filter to put all characters() in one event

http://search.cpan.org/dist/XML-Filter-BufferText/

Perl-style XML objects

http://search.cpan.org/dist/XML-Grove/

Yet another Perl SAX XML Writer

http://search.cpan.org/dist/XML-Handler-YAWriter/

Interface to Gnome libxml2 library

http://search.cpan.org/dist/XML-LibXML/

Simple generic namespace support class

http://search.cpan.org/dist/XML-NamespaceSupport/

Perl extension interface to James Clark's XML parser, expat

http://search.cpan.org/dist/XML-Parser/

Lightweight regexp-based XML parser

http://search.cpan.org/dist/XML-Parser-Lite/

Pure Perl implementation for an XML-RPC client and server

http://search.cpan.org/dist/XML-RPC/

perl module to manage XML RSS files

Regular expressions for XML tokens

http://search.cpan.org/dist/XML-RegExp/

Simple API for XML

http://search.cpan.org/dist/XML-SAX/

Base class SAX Drivers and Filters

http://search.cpan.org/dist/XML-SAX-Base/

Simple API for XML

http://search.cpan.org/dist/XML-SAX-Expat/

SAX2 XML Writer

http://search.cpan.org/dist/XML-SAX-Writer/

Perl extension for comparing XML documents

https://metacpan.org/release/XML-SemanticDiff

Trivial API for reading and writing XML (esp config files)

http://www.mclean.net.nz/

XML::Stream provides you with access to XML Stream

http://search.cpan.org/dist/XML-Stream/

Pure Perl implementation for parsing/writing xml files

http://search.cpan.org/dist/XML-TreePP/

Process huge XML documents by chunks via a tree interface

http://search.cpan.org/dist/XML-Twig/

Simple Perl module for writing XML documents

http://search.cpan.org/dist/XML-Writer/

Modules for parsing and evaluating XPath statements

http://www.w3.org/TR/xpath/

Client and server side XMLRPC implementation

https://metacpan.org/release/XMLRPC-Lite

Dynamically load C libraries into Perl code

https://metacpan.org/release/XSLoader

YAML implementation in Perl

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

Perl YAML Serialization using XS and libyaml

https://metacpan.org/release/YAML-LibYAML

Read/Write YAML files with as little code as possible

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

Use shorter versions of class names

https://metacpan.org/release/aliased

Perl extension to say your class/object working like something else

https://metacpan.org/release/asa