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

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

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

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.

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.

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

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

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

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

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

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

Back in the early days of the web, many people learned Perl because of a wonderful Perl library called CGI. It was simple enough to get started without knowing much about the language and powerful enough to keep you going, learning by doing was much fun. While most of the techniques used are outdated now, the idea behind it is not. Mojolicious is a new endeavor to implement this idea using modern technologies.

This module looks up the Gravatar for any email address by constructing a URL to get the image from gravatar.com. A Gravatar is a Globally Recognized Avatar for a given email address. This allows you to have a global picture associated with your email address.

WWW::Pastebin::PastebinCom::Create provides functionality to paste on Pastebin without API keys.

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 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).

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.

This package provides an old GeoIP database in the legacy .dat format. The data was collected before MaxMind changed the license and format of their databases. It is intended only as a compatibility package for SpamAssassin.

SOAP::Lite is a collection of Perl modules that provide a simple and lightweight interface to the SOAP, both on client and server side.

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.