Minimal try/catch with proper localization of

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

Tiny, yet Moo(se)-compatible type constraint

https://metacpan.org/release/Type-Tiny-XS

Simple data types for common serialisation formats

https://metacpan.org/release/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/

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/

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/

Pure Perl implementation for an XML-RPC client and server

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

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://sourceforge.net/projects/xmlstream/

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/

A 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/

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

https://metacpan.org/release/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

Disables bareword filehandles

https://metacpan.org/release/bareword-filehandles

Transparent BigNumber/BigRational support for Perl

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

Perl common defaults with lower memory usage

http://search.cpan.org/dist/common-sense/