This is a simple HTML link extractor

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

Perl5 module for strip HTML tag

http://search.cpan.org/dist/HTML-Strip/

Generate HTML tables for CGI scripts

http://www.chime.ucl.ac.uk/~rmhiajp/htmltable/index.htm

Some useful data table in parsing HTML

http://search.cpan.org/dist/HTML-Tagset/

Perl module to use HTML Templates from CGI scripts

http://sourceforge.net/projects/html-template/

Web validation in a Perl object using tidy

http://search.cpan.org/dist/HTML-Tidy/

Collection of modules to manupulate HTML syntax trees

http://search.cpan.org/dist/HTML-Tree/

HTTP Body Parser

http://search.cpan.org/dist/HTTP-Body/

HTTP Cookie jars

http://search.cpan.org/dist/HTTP-Cookies/

WebDAV client library

http://search.cpan.org/dist/HTTP-DAV/

Simple HTTP server class

http://search.cpan.org/dist/HTTP-Daemon/

Conversion routines for the HTTP protocol date formats

http://search.cpan.org/dist/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

http://search.cpan.org/dist/HTTP-Message/

HTTP MultiPart Parser

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

Implementation of the HTTP content negotiation algorithm

http://search.cpan.org/dist/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

Lightweight field hash implementation

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

Flatten, unflatten complex data hashes

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

Merges hashes

http://search.cpan.org/dist/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

http://search.cpan.org/dist/Heap/

Lexically scoped subroutine wrappers for Perl

http://search.cpan.org/dist/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)

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

Open an HTML file with automatic charset detection

http://search.cpan.org/dist/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

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

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

http://search.cpan.org/dist/IO-Socket-INET6/

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

http://search.cpan.org/dist/IO-Socket-IP/

Perl5 interface to SSL sockets

http://search.cpan.org/dist/IO-Socket-SSL/

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

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

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

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

IO:: style interface to Compress::Zlib

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

Use IO handles with non-file objects

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

Fast lookup of country codes from IP addresses

http://search.cpan.org/dist/IP-Country/

IPC::Run - Run subprocesses with piping and redirection

http://search.cpan.org/dist/IPC-Run/

Run a subprocess in batch mode

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

A simple interface to access shared memory

http://search.cpan.org/dist/IPC-ShareLite/