Calling Perl's in-built system function is easy, determining if it was successful is hard. Let's face it, $? isn't the nicest variable in the world to play with, and even if you do check it, producing a well-formatted error string takes a lot of work.

IPC::System::Simple takes the hard work out of calling external commands.

Locale::gettext provides an object oriented interface to the internationalization functions provided by the C library.

Config::Simple is a class representing configuration file object. It supports several configuration file syntax and tries to identify the file syntax automatically. The library supports parsing, updating and creating configuration files.

Term::ProgressBar is a wonderful module for showing progress bars on the terminal. This module acts very much like that module when it is run interactively. However, when it is not run interactively (for example, as a cron job) then it does not show the progress bar.

This module provides routines for parsing date string into time values and formatting dates into ASCII strings.

This module is a factory for dispensing Tree::Simple::Visitor::* objects.

This module automagically generates accessors/mutators for your class.

File::HomeDir is a module for locating the directories that are owned by a user (typically your user) and to solve the various issues that arise trying to find them consistently across a wide variety of platforms.

Class::ErrorHandler provides an error-handling mechanism that is generic enough to be used as the base class for a variety of OO classes. Subclasses inherit its two error-handling methods, error and errstr, to communicate error messages back to the calling program.

This module provides the class keyword and related others (method, field and ADJUST) in a forward-compatible way.

This module is for manipulating data as hierarchical tag/value pairs (Structured TAGs or Simple Tree AGgregates). These datastructures can be represented as nested arrays, which have the advantage of being native to Perl.

Display Perl variables and objects on screen, properly formatted (to be inspected by a human).

This is a meta-package containing specifications for installing all the Test::Run plugins.

Text::NeatTemplate provides a simple, middleweight but fast template engine, for when you need speed rather than complex features, yet need more features than simple variable substitution.

CHI provides a unified caching API, designed to assist a developer in persisting data for a specified period of time.

The CHI interface is implemented by driver classes that support fetching, storing and clearing of data. Driver classes exist or will exist for the gamut of storage backends available to Perl, such as memory, plain files, memory mapped files, memcached, and DBI.

The DateTime::Set module provides a date/time sets implementation. It allows, for example, the generation of groups of dates, like "every wednesday", and then find all the dates matching that pattern, within a time range.

Mouse is a Moose compatible object system that implements a subset of the functionality for reduced startup time.

This module allows you to read and write an OLE-Structured file. OLE (Object Linking and Embedding) is a technology to store hierarchical information such as links to other documents within a single file.

Statistics::Distributions calculates percentage points (5 significant digits) of the u (standard normal) distribution, the student's t distribution, the chi-square distribution and the F distribution. It can also calculate the upper probability (5 significant digits) of the u (standard normal), the chi-square, the t and the F distribution.

YAML::Syck provides a Perl interface to the libsyck data serialization library. It exports the Dump and Load functions for converting Perl data structures to YAML strings, and the other way around.

The Regexp::Grammars module adds a small number of new regex constructs that can be used within Perl 5.10 patterns to implement complete recursive-descent parsing. It allows you to go beyond matching complex, nested and recursive structures, and allows you to parse and extract hierarchical data from it.

Class:Unload unloads a given class by clearing out its symbol table and removing it from %INC.

This module is a simple interface to extensible logging. It exists to abstract your logging interface so that logging is as painless as possible, while still allowing you to switch from one logger to another.

The File::LibMagic module is a simple perl interface to libmagic from the file package.