The Digest::SHA Perl module implements the hash functions of the SHA family. It also provides the shasum binary.

Hash::MultiValue is an object (and a plain hash reference) that may contain multiple values per key, inspired by MultiDict of WebOb.

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.

Text::Unidecode provides a function, unidecode(...) that takes Unicode data and tries to represent it in US-ASCII characters (i.e., the universally displayable characters between 0x00 and 0x7F). The representation is almost always an attempt at transliteration-- i.e., conveying, in Roman letters, the pronunciation expressed by the text in some other writing system.

This module implements a Singleton class from which other classes can be derived. By itself, the Class::Singleton module does very little other than manage the instantiation of a single object.

It's boring to deal with opening files for IO, converting strings to handle-like objects, and all that. With Mixin::Linewise::Readers and Mixin::Linewise::Writers, you can just write a method to handle handles, and methods for handling strings and file names are added for you.

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.

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.

Dates are complex enough without times and timezones. This module may be used to create simple date objects. It handles validation, interval arithmetic, and day-of-week calculation. It does not deal with hours, minutes, seconds, and time zones.

This module provides some extra datatypes that are used by common serialisation formats such as JSON or CBOR.

Time::Duration::Parse is a module to parse human readable duration strings like "2 minutes" and "3 seconds" to seconds.

This module is meant as a debugging aid. It can be used to make a script complain loudly with stack backtraces when warn()-ing or die()ing.

Carp::Assert is intended for a purpose like the ANSI C library assert.h.

This package provides a class Encode::Detect to detect the encoding of data.

This module provides a function-based interface to dynamic loading as used by Perl. Some details of dynamic loading are very platform-dependent, so correct use of these functions requires the programmer to be mindfulof the space of platform variations.

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.

This module implements an interface to the Linux 2.6.13 and later Inotify file change notification system.

File::Find::Object::Rule is an alternative Perl interface to File::Find::Object.

This package allows you to analyze tests from the command line using Test::Run.

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 policy checks for perlsecret operators in your code and warns you about them. You can override the secrets that are allowed or disallowed using the parameters allow_secrets and disallow_secrets. The default is to simply disallow everything.

This class provides a tie constructor that returns the object it was given as it's first argument. This way side effects of calling $object->TIEHASH are avoided.

Hash::Merge merges two arbitrarily deep hashes into a single hash. That is, at any level, it will add non-conflicting key-value pairs from one hash to the other, and follows a set of specific rules when there are key value conflicts. The hash is followed recursively, so that deeply nested hashes that are at the same level will be merged when the parent hashes are merged.

Lexical::Persistence introduces persistent lexical variable values for arbitrary calls.