Extensions to PPI

https://metacpan.org/release/PPIx-Utilities

List all constants declared in a package

https://metacpan.org/release/Package-Constants

Manage deprecation warnings for your distribution

https://metacpan.org/release/Package-DeprecationManager

Routines for manipulating stashes

https://metacpan.org/release/Package-Stash

Faster and more correct implementation of the Package::Stash API

http://metacpan.org/release/Package-Stash-XS

Parameterizable packages

https://metacpan.org/release/Package-Variant

play with Perl lexical variables

https://metacpan.org/release/PadWalker

Utility functions to aid in parameter checking

https://metacpan.org/release/Params-Util

Validate method/function parameters

https://metacpan.org/release/Params-Validate

Build an optimized subroutine parameter validator once, use it forever

https://metacpan.org/release/Params-ValidationCompiler

Parse META.yml and other similar CPAN metadata files

http://search.cpan.org/dist/Parse-CPAN-Meta/

IDL compiler written in Perl

http://search.cpan.org/dist/Parse-Pidl/

Recursive descent parsing framework for Perl

https://metacpan.org/release/Parse-RecDescent

Perl5 routines that present a simple interface to parse syslog files

https://metacpan.org/release/Parse-Syslog

Perl extension for generating and using LALR parsers

https://metacpan.org/release/Parse-Yapp

Perl module with utilities to read and manipulate patches and CVS

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

Cross-platform path specification manipulation

https://metacpan.org/release/Path-Class

Perl module for portably manipulating file specifications

https://metacpan.org/release/PathTools

Critique Perl source for style and standards

https://metacpan.org/release/Perl-Critic

Interface for using perl5 to access PostgreSQL databases

https://www.postgresql.org/

Checks if the documentation of a module is comprehensive

https://metacpan.org/release/Pod-Coverage

For resolving Pod E<...> sequences

https://metacpan.org/release/Pod-Escapes

Module to convert POD to Markdown

https://metacpan.org/release/Pod-Markdown

POD Object Model

https://metacpan.org/release/Pod-POM

Modules to work with POD (Plain Old Documentation)

https://metacpan.org/release/Pod-Parser

Convert POD to README file

https://metacpan.org/release/Pod-Readme

Framework for parsing Pod

https://metacpan.org/release/Pod-Simple

Interpret and act on wait() status values

https://metacpan.org/release/Proc-WaitStat

XML-RPC client and server library for Perl

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

Perl 5 module for Term::ReadLine editing without GNU readline

http://search.cpan.org/dist/Term-ReadLine-Perl/

Facility for creating read-only scalars, arrays, hashes

https://metacpan.org/release/Readonly

Regexp::Common - Provide commonly requested regular expressions

https://metacpan.org/release/Regexp-Common

Return::Value - Polymorphic Return Values

https://metacpan.org/release/Return-Value

Roles, like a nouvelle cusine portion size slice of Moose

https://metacpan.org/release/Role-Tiny

Simple HTTP Router

https://metacpan.org/release/Router-Simple

Parse SGML documents using OpenSP

https://metacpan.org/release/SGML-Parser-OpenSP

Perl module for postprocessing the output from sgmls and nsgmls

https://metacpan.org/release/DMEGG/SGMLSpm-1.03ii

Driver-based API for sending SMS messages

https://metacpan.org/release/SMS-Send

Perl5 module providing rudimentary access to SNMPv1 and v2 agents

http://www.switch.ch/misc/leinen/snmp/perl/

Client and server side SOAP implementation

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

Perl extension to generate SQL from Perl data structures

https://metacpan.org/release/SQL-Abstract

SQL Portability layer for LIMIT emulation

https://metacpan.org/release/SQL-Abstract-Limit

Perl5 module for SQL parsing and processing

https://metacpan.org/release/SQL-Statement

Manipulate structured data definitions (SQL and more)

http://search.cpan.org/dist/SQL-Translator/

Perl subroutines that would be nice to have in the perl core

https://metacpan.org/release/Scalar-List-Utils

Lexically scoped resource management

https://metacpan.org/release/Scope-Guard

Manages sets of integers

https://metacpan.org/release/Set-IntSpan

Networking constants and support functions

https://metacpan.org/release/Socket

IPv6 related part of the C socket.h defines and structure manipulators

https://metacpan.org/release/Socket6

Type constraints and coercions for Perl

https://metacpan.org/release/Specio