PostgreSQL is the most advanced open-source database available anywhere

https://www.postgresql.org/

Simple script to analyse your PostgreSQL database configuration, and give tuning advice

https://postgresqltuner.pl

Advanced DNS server with multiple backends including SQL

https://www.powerdns.com/auth.html

CPU clock speed/frequency daemon

https://github.com/lonkamikaze/powerdxx

Fixed width sans fonts for use with powerline

https://github.com/powerline/fonts

Tool for doing remote power control

https://github.com/chaos/powerman

A daemon that connects local terminal device to a terminal server

http://rnoc.urc.ac.ru/~anton/projects/pr/PR.html

PreferencePanes framework for GNUstep

GNUstep workspace manager

http://www.nongnu.org/backbone/

Open-Source e-Commerce Software for Web 2.0

https://www.prestashop.com/

Simple image viewer

http://home.gna.org/gsimageapps/

Image filtering and manipulation using GNUstep

http://price.sourceforge.net/

Privoxy is a web proxy with advanced filtering capabilities

https://www.privoxy.org/

Roman serif with blackletter elements

https://www.theleagueofmoveabletype.com/prociono

Local mail delivery agent

http://www.procmail.org/

Ultimate programming font

https://tobiasjung.name/profont/

Highly configurable FTP daemon

http://www.proftpd.org/

The perfect monospaced bitmap programming fonts

http://upperbounds.net/

The perfect monospaced bitmap programming fonts, TTF version

http://upperbounds.net/

Utilities and library to manipulate ReiserFS partitions

https://reiserfs.osdn.org.ua

Java class file shrinker, optimizer, and obfuscator

https://www.guardsquare.com/en/products/proguard

Cartographic Projections library

https://github.com/OSGeo/PROJ

A development environment for GNUstep

http://www.gnustep.org/experience/ProjectCenter.html

Collectd exporter for Prometheus

https://github.com/prometheus/collectd_exporter

Systems monitoring and alerting toolkit

https://prometheus.io/

Systems monitoring and alerting toolkit

https://prometheus.io/

Timescale analytical platform for Prometheus metrics

https://www.timescale.com/promscale

Data interchange format library

https://github.com/protocolbuffers/protobuf

Code generator and libraries to use Protocol Buffers from pure C

https://github.com/protobuf-c/protobuf-c

Core Protocol Buffers library

https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java

Data interchange format library

https://github.com/google/protobuf

Converters for simple fixed-width bitmap fonts

http://www.seasip.info/Unix/PSF/

New shell made entirely out of a Perl script

https://metacpan.org/release/psh

Conversion utility to convert Psion 5(MX) files into other formats

https://frodo.looijaard.name/project/psiconv

List processes as a tree

https://github.com/FredHucht/pstree

Utilities for manipulating PostScript documents

http://gershwin.ens.fr/vdaniel/Doc-Locale/Outils-Gnu-Linux/PsUtils/

GNU Portable Threads

http://www.gnu.org/software/pth/

GNU Portable Threads

http://www.gnu.org/software/pth/

Pthread-based thread pool for C/C++ for arrays parallelization

https://github.com/Maratyszcza/pthreadpool

Cross platform C++ library, used by OPAL

http://www.opalvoip.org

Terminal for GNOME with first-class support for containers

https://gitlab.gnome.org/chergert/ptyxis

Public Suffix List by Mozilla

https://publicsuffix.org/

Light-weight, simple and fast XML parser for C++ with XPath support

http://pugixml.org/

Script to update snort-2.8+ rules

https://github.com/shirkdog/pulledpork/

Sound server for UNIX

http://pulseaudio.org/

Pulseaudio bindings for Qt

https://invent.kde.org/libraries/pulseaudio-qt

Discord plugin for libpurple

https://github.com/EionRobb/purple-discord

Facebook plugin for libpurple

https://github.com/dequis/purple-facebook

Mattermost plugin for libpurple

https://github.com/EionRobb/purple-mattermost

Pipe throughput monitor

https://www.ivarch.com/programs/pv.shtml