Perl module to use HTML Templates from CGI scripts

https://metacpan.org/release/HTML-Template

Web validation in a Perl object using tidy

https://metacpan.org/release/HTML-Tidy

Collection of modules to manipulate HTML syntax trees

https://metacpan.org/release/HTML-Tree

HTTP Body Parser

https://metacpan.org/release/HTTP-Body

HTTP Cookie jars

https://metacpan.org/release/HTTP-Cookies

WebDAV client library

https://metacpan.org/release/HTTP-DAV

Simple HTTP server class

https://metacpan.org/release/HTTP-Daemon

Conversion routines for the HTTP protocol date formats

https://metacpan.org/release/HTTP-Date

PSGI compliant HTTP Entity Parser

https://search.mcpan.org/dist/HTTP-Entity-Parser/

Perl extension for faster implementation of HTTP::Headers

https://metacpan.org/release/HTTP-Headers-Fast

Perl5 modules for Lightweight HTTP implementation

https://metacpan.org/release/HTTP-Lite

Representation of HTTP style messages

https://metacpan.org/release/HTTP-Message

HTTP MultiPart Parser

https://search.mcpan.org/dist/HTTP-MultiPartParser/

Implementation of the HTTP content negotiation algorithm

https://metacpan.org/release/HTTP-Negotiate

Setup a CGI environment from a HTTP::Request

https://metacpan.org/release/HTTP-Request-AsCGI

Simple standalone HTTP daemon

https://metacpan.org/release/HTTP-Server-Simple

PSGI handler for HTTP::Server::Simple

https://metacpan.org/release/HTTP-Server-Simple-PSGI

Check the HTTP response code for a link

https://metacpan.org/release/HTTP-SimpleLinkChecker

Get the byte size of an internet resource

https://metacpan.org/release/HTTP-Size

Add post_multipart to HTTP::Tiny

https://metacpan.org/release/HTTP-Tiny-Multipart

Lightweight field hash implementation

https://metacpan.org/release/Hash-FieldHash

Flatten, unflatten complex data hashes

https://metacpan.org/pod/Hash::Flatten

Merges hashes

https://metacpan.org/release/Hash-Merge

Perl extension to provide the stuff missing in Hash::Util

https://metacpan.org/release/Hash-MoreUtils

Perl extension to store multiple values per key

http://search.cpan.org/dist/Hash-MultiValue/

Perl extensions for keeping data partially sorted

https://metacpan.org/release/Heap

Lexically scoped subroutine wrappers for Perl

https://metacpan.org/release/Hook-LexWrap

Abstract Base Class to build modules to capture output

https://metacpan.org/release/IO-Capture

Capture STDOUT/STDERR from subprocesses and XS/C modules

https://metacpan.org/release/IO-CaptureOutput

Perl5 compression modules (bzip2, deflate, gzip, zlib, zip)

https://metacpan.org/release/IO-Compress

Write lzma files / buffers

https://metacpan.org/release/IO-Compress-Lzma

Open an HTML file with automatic charset detection

https://metacpan.org/release/IO-HTML

Perl extension for working with IO::Handle like objects

https://metacpan.org/release/IO-Handle-Util

IO::Multiplex - Manage IO on many file handles

https://metacpan.org/release/IO-Multiplex

Select a pager, optionally pipe it output if destination is a TTY

https://metacpan.org/release/IO-Pager

Portably create pipe() or pipe-like handles, one way or another

https://metacpan.org/release/IO-Pipely

Easy interface to IO::Pty

https://metacpan.org/release/IO-Pty-Easy

Supporting module for SOAP::Lite

http://search.cpan.org/dist/IO-SessionData/

Perl module with object interface to AF_INET6 domain sockets

https://metacpan.org/release/IO-Socket-INET6

Drop-in replacement for IO::Socket::INET supporting IPv4 and IPv6

https://metacpan.org/release/IO-Socket-IP

Perl5 interface to SSL sockets

https://metacpan.org/release/IO-Socket-SSL

Provides a way to create socks client or server both 4 and 5 version

https://metacpan.org/release/IO-Socket-Socks

Simplified Perl5 module to handle I/O on in-core strings

https://metacpan.org/release/IO-String

Use IO handles with non-file objects

https://metacpan.org/release/IO-Stringy

Flexible I/O Perl5 module that allows manipulation of pseudo-TTYs

http://search.cpan.org/dist/IO-Tty/

IO:: style interface to Compress::Zlib

https://metacpan.org/release/IO-Zlib

Fast lookup of country codes from IP addresses

https://metacpan.org/release/IP-Country

Finding and running system commands made easy

https://metacpan.org/release/IPC-Cmd

Run subprocesses with piping and redirection

https://metacpan.org/release/IPC-Run

Run a subprocess in batch mode

https://metacpan.org/release/IPC-Run3