The Getopt::Long module implements an extended getopt function called GetOptions(). It parses the command line from ARGV, recognizing and removing specified options and their possible values.

This function adheres to the POSIX syntax for command line options, with GNU extensions. In general, this means that options have long names instead of single letters, and are introduced with a double dash "--". Support for bundling of command line options, as was the case with the more traditional single-letter approach, is provided but not enabled by default.

JSON::Parse is a module for parsing JSON. It offers parse_json which takes a string containing JSON and returns an equivalent Perl structure, valid_json which returns true or false depending on whether the JSON is correct or not, assert_valid_json which produces a descriptive fatal error if the JSON is invalid, and so on.

DateTime::Format::Flexible attempts to take any string you give it and parse it into a DateTime object.

This module implements an interface to the GNU Readline library. It gives you input line editing facilities, input history management facilities, completion facilities, etc. Term::ReadLine::Gnu is upwards compatible with Term::ReadLine.

This package provides a Perl library that allows refreshing classes at runtime.

This module provides functions to encode and decode UTF-8 encoding form as specified by Unicode and ISO/IEC 10646:2011.

This module implements Spreadsheet::XLSX parsing Microsoft Excel 2007 xlsx files.

Sys::CPU is a module for counting the number of CPUs on a system, and determining their type and clock speed.

The fundamental task of the autoformat subroutine is to identify and rearrange independent paragraphs in a text. Paragraphs typically consist of a series of lines containing at least one non-whitespace character, followed by one or more lines containing only optional whitespace. This is a more liberal definition than many other formatters use: most require an empty line to terminate a paragraph. Paragraphs may also be denoted by bulleting, numbering, or quoting (see the following sections).

This module implements the C3 algorithm, which aims to provide a sane method resolution order under multiple inheritance.

The functions exported by this module deal with runtime handling of Perl modules, which are normally handled at compile time.

This is a CPAN Perl module that verifies the solutions of various variants of card Solitaire. It does not aim to try to be a solver for them, because this is too CPU intensive to be adequately done using perl5 (as of perl-5.10.0). Instead, what Games-Solitaire-Verify does is verify the solutions and makes sure they are correct.

YAML::Tiny is a perl class for reading and writing YAML-style files, written with as little code as possible, reducing load time and memory overhead.

This module provides some XS functions to assist in writing parsers for sub-like syntax, primarily for authors of keyword plugins using the PL_keyword_plugin hook mechanism.

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

This module provides user-defined Unicode properties that deal with width status of East Asian characters, as specified in Unicode® Standard Annex #11.

PPIx::Utils is a collection of utility functions for working with PPI documents. The functions are organized into submodules, and may be imported from the appropriate submodules or via this module.

Date::Calc::XS is an XS wrapper and C library plug-in for Date::Calc.

This module allows one to run a subset of the subtest tests given in a test file.

The module declaration takes a whitelist of the subtests we want to run. Any subtest that doesn't match any of the whitelist items will be skipped (or potentially bypassed).

Unicode::LineBreak implements the line breaking algorithm described in Unicode Standard Annex #14. The East_Asian_Width property defined by Annex #11 is used to determine breaking positions.

This module offers a minimalist class construction kit. It uses no non-core modules for any recent Perl.

Switch is a Perl module which implements a generalized case mechanism. The module augments the standard Perl syntax with two new statements: switch and case.

This module is allows applications to retrieve per-user characteristics.

This module allows for anonymous packages that are independent of the main namespace and only available through an object instance, not by name.