Catalyst is a modern framework for making web applications. It is designed to make it easy to manage the various tasks you need to do to run an application on the web, either by doing them itself, or by letting you "plug in" existing Perl modules that do what you need.

The Template Toolkit is a collection of modules which implement an extensible template processing system. It was originally designed and remains primarily useful for generating dynamic web content, but it can be used equally well for processing any other kind of text based documents: HTML, XML, POD, PostScript, LaTeX, and so on.

This module tries to find middle ground between one at a time and all at once processing of data sets. The purpose of this module is to avoid the overhead of implementing an iterative api when this isn't necessary, without breaking forward compatibility in case that becomes necessary later on.

Exporter::Declare is a meta-driven exporting tool. It tries to adopt all the good features of other exporting tools, while replacing bad interfaces. Exporter::Declare also provides hooks that allow you to add options and arguments for import. Exporter::Declare's meta-driven system allows for top-notch introspection.

Class::XSAccessor implements fast read, write, and read/write accessors in XS. Additionally, it can provide predicates such as "has_foo()" for testing whether the attribute "foo" is defined in the object. It only works with objects that are implemented as ordinary hashes. Class::XSAccessor::Array implements the same interface for objects that use arrays for their internal representation.

Crypt::RandPasswd provides three functions that can be used to generate random passwords, constructed from words, letters, or characters. This code is a Perl implementation of the Automated Password Generator standard, like the program described in "A Random Word Generator For Pronounceable Passwords". This code is a re-engineering of the program contained in Appendix A of FIPS Publication 181, "Standard for Automated Password Generator".

This module is a probability based, corpus-trained tagger that assigns part-of-speech tags to English text based on a lookup dictionary and a set of probability values. The tagger assigns appropriate tags based on conditional probabilities - it examines the preceding tag to determine the appropriate tag for the current word. Unknown words are classified according to word morphology or can be set to be treated as nouns or other parts of speech. The tagger also extracts as many nouns and noun phrases as it can, using a set of regular expressions.

When an undefined variable is dereferenced, it gets silently upgraded to an array or hash reference (depending of the type of the dereferencing). This behaviour is called autovivification and usually does what you mean but it may be unnatural or surprising because your variables get populated behind your back. This is especially true when several levels of dereferencing are involved, in which case all levels are vivified up to the last, or when it happens in intuitively read-only constructs like exists. The pragma provided by this package lets you disable autovivification for some constructs and optionally throws a warning or an error when it would have happened.

This Perl module provides Unicode normalization forms.

Test::FailWarnings adds test failures if warnings are caught.

This package provides an ASCII mapping for the eucJP encoding.

This package provides methods to cache compiled XML translators.

This package provides modules to do 3D graphics in PDL.

This module is a data dumper optimized for logging of arbitrary parameters.

Crypt::OpenSSL::RSA does RSA encoding and decoding (using the OpenSSL libraries).

This module provides configure time utilities for using C headers, libraries, or OS features.

CPAN::DistnameInfo uses heuristics to extract the distribution name and version from filenames.

Email::Date::Format provides a means for generating an RFC 2822 compliant datetime string.

This module provides a class to monitor a directory for changes made to any file.

Sys::Hostname::Long tries very hard to get the full hostname of a system.

The Compress::Raw::Zlib module provides a Perl interface to the zlib compression library.

Test::DistManifest provides a simple method of testing that a MANIFEST file matches its distribution.

shell-quote lets you pass arbitrary strings through the shell so that they won't be changed.