Establish an ISA relationship with base classes at compile time

https://metacpan.org/release/parent

Client interface to LDAP (includes Net::LDAP)

https://metacpan.org/release/perl-ldap

Turn on strict and make all warnings fatal

https://metacpan.org/release/strictures

Perl bindings for Version control system

http://subversion.apache.org/

Perl interpreter-based threads

https://metacpan.org/release/threads

Perl extension for sharing data structures between threads

http://search.cpan.org/dist/threads-shared/

Script that helps install Postscript fonts in X Window System

Perl extension for Version Objects

https://metacpan.org/release/version

File archiver with high compression ratio

http://p7zip.sourceforge.net/

Unicode font supporting all the Myanmar characters

http://scripts.sil.org/Padauk

Generic visualization tool for GNUstep (Gantt chart and more)

http://www-id.imag.fr/Logiciels/paje/

PAM module for two-step authentication from Google

https://github.com/google/google-authenticator-libpam

Authenticate applications requiring PAM services

http://www.marcuscom.com/pam_helper/

Pam module for authenticating with LDAP

http://www.padl.com/OSS/pam_ldap.html

PAM module for authenticating with a Yubico YubiKey

https://developers.yubico.com/yubico-pam/

Mark Crispin's C-client mail access routines forked from UW

https://github.com/jonabbey/panda-imap

Open-source framework for the layout and rendering of i18n text

https://www.pango.org/

C++ wrapper for Pango

http://gtkmm.sourceforge.net/

Deprecated pangoX support

http://www.pango.org/

Mail/MIME handling library for GNUstep

https://www.nongnu.org/gnustep-nonfsf/gnumail/index.html

ParaType font collection for the languages of Russia

https://www.paratype.com/public/

GNU patch utility

https://savannah.gnu.org/projects/patch/

Small collection of programs that operate on patch files

http://cyberelk.net/tim/software/patchutils/

Measurement tool for capacity estimation of network paths

http://www.pathrate.org

GTK mixer for PulseAudio

http://freedesktop.org/software/pulseaudio/pavucontrol/

Parallel BZIP2

http://compression.ca/pbzip2/

PC-BSD Shell Library

https://github.com/trueos/pcbsd

The Portable C Compiler

http://pcc.ludd.ltu.se/

Purdue Compiler Construction Tool Set

http://www.polhode.com/pccts.html

Convert X font from PCF to BDF

https://github.com/ganaware/pcf2bdf

Database of all known IDs used in PCI devices

https://pci-ids.ucw.cz/ https://github.com/pciutils/pciids

PCMan File Manager

http://wiki.lxde.org/en/PCManFM

Perl Compatible Regular Expressions library

https://www.pcre.org/

Perl Compatible Regular Expressions library, version 2

https://www.pcre.org/

Middleware library to access a smart card using SCard API (PC/SC)

https://pcsclite.apdu.fr/

C library for dynamically generating PDF

http://www.pdflib.de/

Add outlines to PDF files

https://github.com/eugmes/fntsample

The Public Domain Korn Shell

http://www.cs.mun.ca/~michael/pdksh/

Caching (permanently, writes to disk on exit) DNS proxy-server

http://members.home.nl/p.a.rombouts/pdnsd/

PEAR framework for PHP

https://pear.php.net/

PEAR classes providing an easy way to perform HTTP requests

https://pear.php.net/package/HTTP_Request

PEAR Network Socket Interface

https://pear.php.net/package/Net_Socket

Easy parsing of URLs

https://pear.php.net/package/Net_URL

PEAR Class for parsing and handling URL

http://pear.php.net/package/Net_URL2/

Engine for performing and rendering text diffs

https://pear.php.net/package/Text_Diff

APC User Caching

https://pecl.php.net/package/apcu

PECL wrapper around the gpgme library

https://pecl.php.net/package/gnupg

PHP wrapper to the ImageMagick/GraphicsMagick library version 6

https://pecl.php.net/package/imagick

PHP extension for mcrypt, removed in PHP 7.2

https://pecl.php.net/package/mcrypt

PECL extension to create PDF on the fly

https://pecl.php.net/package/pdflib