DateTime is a class for the representation of date/time combinations. It represents the Gregorian calendar, extended backwards in time before its creation (in 1582).

This package eases the writing of command line utilities, accepting commands and subcommands and so on. These commands can form a tree, which is mirrored in the package structure. On invocation, each command along the path through the tree (starting from the top-level command through to the most specific one) is instantiated.

File::Next is a Perl CPAN module for finding files.

This module implements the Brew edit distance that is very close to the dynamic programming technique used for the Wagner-Fischer (and so for the Levenshtein) edit distance.

This module provides a basic way to discover if a piece of perl code is allocating perl data and not releasing them again.

This module provides a file handle that hides the beginning of a file, by modifying the seek() and tell() calls.

Class::Method::Modifiers provides three modifiers: before, around, and after. before and after are run just before and after the method they modify, but can not really affect that original method. around is run in place of the original method, with a hook to easily call that original method.

The Error package provides two interfaces. Firstly Error provides a procedural interface to exception handling. Secondly Error is a base class for errors/exceptions that can either be thrown, for subsequent catch, or can simply be recorded.

This module implements the algorithm for the solution of Bezier curves as presented by Robert D Miller in Graphics Gems V, "Quick and Simple Bezier Curve Drawing".

SDL Perl is a package of Perl modules that provide both functional and object oriented interfaces to the Simple DirectMedia Layer for Perl5. This package takes some liberties with the SDL API, and attempts to adhere to the spirit of both the SDL and Perl.

This module is about the native integer numerical data type. A native integer is one of the types of datum that can appear in the numeric part of a Perl scalar. This module supplies constants describing the native integer type. Both signed and unsigned representations are handled.

Sub::Install makes it easy to install subroutines into packages without the unsightly mess of C<no strict> or typeglobs lying about where just anyone can see them.

Mozilla::CA provides a copy of Mozilla's bundle of Certificate Authority certificates in a form that can be consumed by modules and libraries based on OpenSSL.

Pod::Parser is a base class for creating POD filters and translators. It handles most of the effort involved with parsing the POD sections from an input stream, leaving subclasses free to be concerned only with performing the actual translation of text.

NOTE: This module is considered legacy. New projects should prefer Pod::Simple instead.

This module exports methods useful for factory classes.

Async::Interrupt implements a single feature only of interest to advanced perl modules, namely asynchronous interruptions (think "UNIX signals", which are very similar).

Sometimes, modules wish to run code asynchronously (in another thread, or from a signal handler), and then signal the perl interpreter on certain events. One common way is to write some data to a pipe and use an event handling toolkit to watch for I/O events. Another way is to send a signal. Those methods are slow, and in the case of a pipe, also not asynchronous - it won't interrupt a running perl interpreter.

This module implements asynchronous notifications that enable you to signal running perl code from another thread, asynchronously, and sometimes even without using a single syscall.

Data::UUID provides a framework for generating Universally Unique Identifiers (UUIDs), also known as Globally Unique Identifiers (GUIDs). A UUID is 128 bits long, and is guaranteed to be different from all other UUIDs/GUIDs generated until 3400 CE.

Devel::CheckLib is a Perl module that checks whether a particular C library and its headers are available. You can also check for the presence of particular functions in a library, or even that those functions return particular results.

POSIX::strftime::Compiler provides GNU C library compatible strftime(3). But this module is not affected by the system locale. This feature is useful when you want to write loggers, servers, and portable applications.

With this module, you can calculate terminal character widths that vary by locale. This module supplies features similar to wcwidth(3) and wcswidth(3) in C language.

This package provides a way to sort revision-like numbers.

This is Graph, a Perl module for dealing with graphs, the abstract data structures.

This package allows you to stop processing the entire test suite after the first failure, instead of going all the way through it.

The package provides a number of useful typemaps as submodules of ExtUtils::Typemaps.