Test::DistManifest provides a simple method of testing that a MANIFEST file matches its distribution.

Test::Needs allows you to skip test scripts if modules are not available. The requested modules will be loaded, and optionally have their versions checked. If the module is missing, the test script will be skipped. Modules that are found but fail to compile will exit with an error rather than skip.

If used in a subtest, the remainder of the subtest will be skipped.

There are a number of different situations (like testing caching code) where you want to want to do a number of tests, and then verify that some underlying subroutine deep within the code was called a specific number of times.

Test::SubCalls module provides a number of functions for doing testing in this way in association with your normal Test::More (or similar) test scripts.

The Compress::Raw::Zlib module provides a Perl interface to the zlib compression library.

The IO::Zlib module is a Perl IO style interface to Compress:Zlib that simplifies reading and writing compressed data.

PerlIO::gzip provides a PerlIO layer that manipulates files in the format used by the gzip program.

Perl's IO::Compress module provides an interface for reading and writing compressed data created with the zlib and bzip2 libraries.

The Compress::Bzip2 module provides a Perl interface to the Bzip2 compression library. A relevant subset of the functionality provided by Bzip2 is available in this module.

It allows you to extract any archive file of the type .tar, .tar.gz, .gz, .Z, tar.bz2, .tbz, .bz2, .zip, .xz,, .txz, .tar.xz or .lzma without having to worry how it does so, or use different interfaces for each type by using either Perl modules, or command-line tools on your system.

This module Compress::Raw::Bzip2 provides a Perl interface to the bzip2 compression library.

The Archive::Zip module allows a Perl program to create, manipulate, read, and write Zip archive files.

This packages allows you to interpolate the value Y from X using a list of (X, Y) pairs.

This package provides the Math::MatrixReal module. It implements the data type "matrix of real numbers" (and consequently also "vector of real numbers").

This package provides a library and simple REPL for the Perl Data Language.

The Math::Cephes module provides a Perl interface to over 150 functions of the Cephes math library.

This package provides modules to do 3D graphics in PDL.

This package provides a library and simple REPL for the Perl Data Language.

This package provides PGPLOT bindings for Perl. It uses giza instead of PGPLOT for the implementation, though.

This module defines a format for database URIs, and provides a URI class to handle these.

This module implements a wrapper for Net::SMTP, enabling over-SSL/STARTTLS support. This module inherits most of all the methods from Net::SMTP(2.X).

This module provides functions to percent-encode and percent-decode URI strings as defined by RFC 3986. Percent-encoding URI's is informally called URI escaping. This is the terminology used by this module, which predates the formalization of the terms by the RFC by several years.

This package provides a class method constructs a new Net::IMAP::Simple object. It takes one required parameter which is the server to connect to, and additional optional parameters.

This module is a suite of tools for implementing DMARC. It adheres to the 2013 DMARC draft, intending to implement every MUST and every SHOULD.

The package provides bindings for GNU Libidn, a C library for handling Internationalized Domain Names according to IDNA (RFC 3490), in a way very much inspired by Turbo Fredriksson's PHP-IDN.