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Tie::Hash::MultiValue allows you to have hashes which store their values in anonymous arrays, appending any new value to the already-existing ones. This means that you can store as many items as you like under a single key, and access them all at once by accessing the value stored under the key.

acsccid is a PC/SC driver for Linux/Mac OS X and it supports ACS CCID smart card readers. This library provides a PC/SC IFD handler implementation and communicates with the readers through the PC/SC Lite resource manager (pcscd).

This Perl module presents hashes in sorted order.

Tie::Hash::TwoWay will take a list of one-way associations and transparently create their reverse. For instance, say you have a list of machines, and a list of classes that each machine belongs to. Tie::Hash::TwoWay will take the machines, one by one, with an associated array reference of class names, and build the reverse mapping of classes to machines. All the mappings are stored as hashes. You can access the secondary mappings as if they were hash keys in their own right.

Tie::IxHash is a perl module implementing ordered in-memory associative arrays.

Perl module which implements an ordered hash-like object. It's a cross between a Perl hash and a linked list. Use it whenever you want the speed and structure of a Perl hash, but the orderedness of a list.

This modules causes any warnings produced by test scripts to be captured and stored. It automatically adds an extra test that will run when your script ends to check that there were no warnings. If there were any warnings, the test will give a "not ok" and diagnostics of where, when and what the warning was, including a stack trace of what was going on when the it occurred.

This module provides the ability to use references as hash keys if you first "tie" the hash variable to this module. Normally, only the keys of the tied hash itself are preserved as references; to use references as keys in hashes-of-hashes, use Tie::RefHash::Nestable, included as part of Tie::RefHash. It is implemented using the standard perl TIEHASH interface. Please see the "tie" entry in perlfunc(1) and perltie(1) for more information. The Nestable version works by looking for hash references being stored and converting them to tied hashes so that they too can have references as keys. This will happen without warning whenever you store a refer- ence to one of your own hashes in the tied hash.

Creates a temporary instance of OpenLDAP's slapd daemon to run tests against.