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/

PowerPC emulator

http://pearpc.sourceforge.net/

Alternative PHP Cache

http://pecl.php.net/package/APC

PECL extension for the unicode Bidi algorithm

http://pecl.php.net/package/fribidi/

PECL extension if imlib2

http://pecl.php.net/package/imlib2

PECL extension to support Internationalization(ICU)

http://pecl.php.net/package/intl

Memcached extension

http://pecl.php.net/package/memcache/

PECL extension to create PDF on the fly

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

Help improve the performance of GNUstep applications

Practical Extraction and Report Language

http://www.perl.org/

Indents and reformats Perl scripts to make them easier to read

http://perltidy.sourceforge.net/

Minimalistic, headless, WebKit-based, JavaScript-driven tool

http://www.phantomjs.org/

German phone code / Deutsche Telefonvorwahl (AVON)

KDE multimedia framework

https://phonon.kde.org/

Phoronix Benchmarking Suite

https://www.phoronix-test-suite.com

Xdebug extension for PHP

http://www.xdebug.org/

PHP Scripting Language

http://www.php.net/

The bcmath shared extension for php

http://www.php.net/

PHP wrapper for bsdconv

https://github.com/buganini/php-bsdconv

The bz2 shared extension for php

http://www.php.net/

The calendar shared extension for php

http://www.php.net/

The ctype shared extension for php

http://www.php.net/

The curl shared extension for php

http://www.php.net/

The dba shared extension for php

http://www.php.net/

The dom shared extension for php

http://www.php.net/

The exif shared extension for php

http://www.php.net/

The fileinfo shared extension for php

http://www.php.net/

The filter shared extension for php

http://www.php.net/

The ftp shared extension for php

http://www.php.net/

The gd shared extension for php

http://www.php.net/

The gettext shared extension for php

http://www.php.net/

The gmp shared extension for php

http://www.php.net/

The hash shared extension for php

http://www.php.net/

The iconv shared extension for php

http://www.php.net/

The imap shared extension for php

http://www.php.net/

The json shared extension for php

http://www.php.net/

The ldap shared extension for php

http://www.php.net/

The mbstring shared extension for php

http://www.php.net/

The mcrypt shared extension for php

http://www.php.net/

The mssql shared extension for php

http://www.php.net/

The mysql shared extension for php

http://www.php.net/

The mysqli shared extension for php

http://www.php.net/

The odbc shared extension for php

http://www.php.net/

The openssl shared extension for php

http://www.php.net/

The pcntl shared extension for php

http://www.php.net/

The pdo shared extension for php

http://www.php.net/

The pdo_dblib shared extension for php

http://www.php.net/

The pdo_mysql shared extension for php

http://www.php.net/