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The Pomap-library implements an ADT that maintains maps of partially ordered elements. Whereas a total order allows you to say whether some element is lower, equal or greater than another one, partial orders also allow for a "don-t know" case.

A CPAN::Meta::Requirements object models a set of version constraints like those specified in the META.yml or META.json files in CPAN distributions. It can be built up by adding more and more constraints, and it will reduce them to the simplest representation. Logically impossible constraints will be identified immediately by thrown exceptions.

This module makes it easier to build and manage a base set of imports. Rather than importing a dozen modules in each of your project's modules, you simply import one module and get all the other modules you want. This reduces your module boilerplate from 12 lines to 1.

The Log::Agent::Logger class defines a generic interface for application logging. It must not be confused with the interface provided by Log::Agent, which is meant to be used by re-usable modules that do not wish to commit on a particular logging method, so that they remain true building blocks.

This module lets you call methods of a certain object more easily by exporting them as functions to a package. The exported functions are not called as methods and do not receive an object argument, but instead the object is fixed at the time you import them with this module.

Moose classes (and some other classes) distinguish between an attribute being unset and the attribute being set to undef. To ensure that the Person constructor does not try to set a name or age at all when they are undefined, ugly looking code is often used. A slightly more elegant solution is the maybe function.

Developers hate writing documentation. They'd hate it even more if their computer tattled on them, but maybe they'll be even more thankful in the long run. Even if not, perlmodstyle tells you to, so you must obey. This module provides a mechanism for determining if the pod for a given module is comprehensive.

Symbol::Global::Name takes a reference and optional package name. It returns the name of the referenced variable as long as it's in the package or sub-package and it's a global variable. Returned name is prefixed with type sigil, eg. '$', '@', '%', '&' or '*'.

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.

From README: This module implements a least recently used (LRU) cache in memory through a tie interface. Any time data is stored in the tied hash, that key/value pair has an entry time associated with it, and as the cache fills up, those members of the cache that are the oldest are removed to make room for new entries. So, the cache only "remembers" the last written entries, up to the size of the cache. This can be especially useful if you access great amounts of data, but only access a minority of the data a majority of the time. The implementation is a hash, for quick lookups, overlaying a doubly linked list for quick insertion and deletion. On a WinNT PII 300, writes to the hash were done at a rate 3100 per second, and reads from the hash at 6300 per second. Work has been done to optimize refreshing cache entries that are frequently read from, code like $cache{entry}, which moves the entry to the end of the linked list internally.