Socket::MsgHdr provides advanced socket messaging operations via sendmsg and recvmsg.

It also allows manipulating ancillary data or so-called control information (cmsghdr). This ancillary data may be used for file descriptor passing, IPv6 operations, and a host of implementation-specific extensions.

The Cache modules are designed to assist a developer in persisting data for a specified period of time. Often these modules are used in web applications to store data locally to save repeated and redundant expensive calls to remote machines or databases. People have also been known to use Cache::Cache for its straightforward interface in sharing data between runs of an application or invocations of a CGI-style script or simply as an easy to use abstraction of the file system or shared memory.

File::Find::Object is an object-oriented File::Find replacement in Perl.

File locking in Perl is usually done using the flock function. Unfortunately, this only allows locks on whole files and is often implemented in terms of the flock(2) system function which has some shortcomings (especially concerning locks on remotely mounted file systems) and slightly different behaviour than fcntl(2).

Template::Timer provides inline profiling of the template processing in Perl code.

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".

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

Module::Find lets you find and use modules in categories. This can be useful for auto-detecting driver or plugin modules. You can differentiate between looking in the category itself or in all subcategories.

Manipulating stashes (Perl's symbol tables) is occasionally necessary, but incredibly messy, and easy to get wrong. This module hides all of that behind a simple API.

Number::Range is an object-oriented interface to test if a number exists in a given range, and to be able to manipulate the range.

This module opens a config file and parses its contents for you. The format of config files supported by Config::General is inspired by the well known Apache config format and is 100% compatible with Apache configs, but you can also just use simple name/value pairs in your config files. In addition to the capabilities of an Apache config file it supports some enhancements such as here-documents, C-style comments, and multiline options.

PPIX::QuoteLike parses Perl string literals and things that are reasonably like string literals. Its real reason for being is to find interpolated variables for Perl::Critic policies and similar code.

This module attempts to emulate the behavior of Class::Accessor::Fast as accurately as possible using the Moose attribute system. The public API of Class::Accessor::Fast is wholly supported, but the private methods are not.

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.

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.

This module provides conflicts checking for Module::Runtime, which had a recent release that broke some versions of Moose. It is called from Moose::Conflicts and moose-outdated.

File::ShareDir::Dist finds share directories for distributions. It is a companion module to File::ShareDir.

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

This module is a helper for installing, reading and finding configuration file locations. File::ConfigDir is a module to help out when Perl modules (especially applications) need to read and store configuration files from more than one location.

This module provides syntactical support for try/catch control flows.

Devel::CheckBin is a perl module that checks whether a particular command is available.

Routines to manipulate defhash, a convention to define things more precisely and uniformly using a hash, in Perl.

Array::Utils is a small pure-perl module containing list manipulation routines.

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.