Portable implementation of which(1) in Perl

http://search.cpan.org/dist/File-Which/

Number of source filters for perl5 programs

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

Perl extension providing access to the GSSAPIv2 library

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

Handle ISO-3166 country codes

http://search.cpan.org/dist/Geography-Countries/

Perl module for processing argument vectors

https://metacpan.org/release/Getopt-ArgvFile

Perl module for extended processing of command line options

Graph, the Perl module for graph operations

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

Module to produce HTML 'breadcrumb trails'

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

Determine the encoding of HTML/XML/XHTML documents

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

High-performance, dynamic web site authoring system

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

Perl module for handling CGI HTML paging of arbitrary data

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

Perl5 module for parsing HTML documents

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

Perl extension for scrubbing/sanitizing html

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

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 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/

Representation of HTTP style messages

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

Implementation of the HTTP content negotiation algorithm

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

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/

Various IO modules for Perl

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

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

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

Perl module with object interface to AF_INET6 domain sockets

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

IO::Multiplex - Manage IO on many file handles

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

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/

A simple interface to access shared memory

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

IPC::Signal - Utility functions dealing with signals

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

Database connection caching and organization

http://search.cpan.org/dist/Ima-DBI/

Perl module for getting image information

http://search.cpan.org/dist/Image-Info/

Helper functions for PBM/PGM/PPM image file formats

http://search.cpan.org/dist/Image-PBMlib/

Perl5 module to determine the size of images in several common formats

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

Perl extension to convert to JSON (JavaScript Object Notation)

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

Perl Wrapper Class for the various JSON classes

http://search.cpan.org/dist/JSON-Any/

JSON::XS compatible pure-Perl module

http://search.cpan.org/dist/JSON-PP/

Perl implementation of JSON-RPC 1.1 protocol

https://metacpan.org/release/JSON-RPC

JSON serialising/deserialising, done correctly and fast

http://search.cpan.org/dist/JSON-XS/