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/

Database of robots.txt-derived permissions

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

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/

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/

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/

YAML implementation in Perl

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

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/

Perl Modules of ePerl package: Parse::ePerl, Apache::ePerl

http://www.ossp.org/pkg/tool/eperl/

Perl5 library for WWW access

http://search.cpan.org/dist/libwww-perl/

Collection of Perl5 modules for working with XML

http://search.cpan.org/dist/libxml-perl/

Keep imports and functions out of your namespace

http://search.cpan.org/dist/namespace-clean/

Establish an ISA relationship with base classes at compile time

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

Client interface to LDAP servers

http://ldap.perl.org/

Perl interpreter-based threads

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

Perl extension for sharing data structures between threads

http://search.cpan.org/dist/threads-shared/

Perl extension for Version Objects

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

File archiver with high compression ratio

http://p7zip.sourceforge.net/

Authenticate applications requiring PAM services

http://www.marcuscom.com/pam_helper/

GNU patch utility

http://www.gnu.org/software/patch/patch.html

Small collection of programs that operate on patch files

http://cyberelk.net/tim/software/patchutils/

Measurement tool for capacity estimation of network paths

http://www.pathrate.org

Parallel BZIP2

http://compression.ca/pbzip2/

The Portable C Compiler

http://pcc.ludd.ltu.se/

Purdue Compiler Construction Tool Set

http://www.polhode.com/pccts.html

Database of all known IDs used in PCI devices

http://pciids.sourceforge.net/

Sun PC NFS authentication and printing server

Perl Compatible Regular Expressions library

http://www.pcre.org/

The Public Domain Korn Shell

http://www.cs.mun.ca/~michael/pdksh/

Caching (permanently, writes to disk on exit) DNS proxy-server

http://members.home.nl/p.a.rombouts/pdnsd/

Alternative PHP Cache

http://pecl.php.net/package/APC

PECL extension for the unicode Bidi algorithm

http://pecl.php.net/package/fribidi/