Robust and small WWW server

https://nginx.com/

Free open source daemon for Internet Relay Chat (IRC)

https://ngircd.barton.de/

Small build system closest in spirit to Make

https://ninja-build.org/

Netdev config analyzer

http://sourceforge.net/projects/nipper

Console application which monitors network traffic in real time

http://www.roland-riegel.de/nload/

Port scanning utility for large networks

https://nmap.org/

Cleaned up MH mailer suite

http://savannah.nongnu.org/projects/nmh/

V8 JavaScript for client and server (meta port)

https://nodejs.org/ https://github.com/nodejs/node

V8 JavaScript for client and server

http://nodejs.org/

More functional native binary replacement for /sbin/nologin

Send small notifications to your desktop

https://gitlab.gnome.org/GNOME/notification-daemon

New GNU Portable Threads

https://www.gnupg.org/software/npth/index.html

Perform consistency checks on DNS zone files

http://ee.lbl.gov/ftp.html

Compatibility plugin for Mozilla NPAPI plugins

http://nspluginwrapper.org

Platform-neutral API for system level and libc like functions

https://developer.mozilla.org/docs/Mozilla/Projects/NSPR

Libraries to support development of security-enabled applications

https://developer.mozilla.org/docs/Mozilla/Projects/NSS

RFC 2307 NSS module

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

NSS module implementing multicast DNS name resolution

https://github.com/lathiat/nss-mdns

The Network Time Protocol Distribution

https://www.ntp.org/

Client/server program for testing network performance

Nutrition software to record what you eat

http://nut.sourceforge.net/

nVidia graphic card status and overclocking tool

http://www.linuxhardware.org/nvclock/

Development snapshot of the world-renown nvi editor

http://www.kotnet.org/~skimo/nvi/

NVidia graphics card binary drivers for hardware OpenGL rendering

https://www.nvidia.com/object/unix.html

Display Control Panel for X NVidia driver

http://www.nvidia.com/object/unix.html

Tool to manipulate X configuration files for the NVidia driver

http://www.nvidia.com/object/unix.html

Nils Weller's BSD-licensed C-compiler

http://nwcc.sourceforge.net/

Standalone converter for the OpenOffice.org writer and scalc formats

http://siag.nu/o3read/

Preferences manager for the Openbox window manager

http://openbox.org/wiki/Obconf

Securely delete file[s]

Menu manager for Openbox supporting both static and pipe menus

http://obmenu.sourceforge.net/

Round clock application for X

OCR program implemented as filter

http://www.gnu.org/software/ocrad/ocrad.html

Help you update your snort rules after each update

http://oinkmaster.sourceforge.net/

Regular expressions library compatible with POSIX/GNU/Perl

https://github.com/kkos/oniguruma

A BSDL Regular Expressions library compatible with POSIX/GNU/Perl

http://www.geocities.jp/kosako3/oniguruma/

Oniguruma is a regular expressions library

http://www.geocities.jp/kosako3/oniguruma/

Open-source COBOL compiler

http://www.opencobol.org/

Motif X11 Toolkit (industry standard GUI (IEEE 1295))

https://motif.ics.com/

3D positional spatialized sound library

http://www.openal.org/

Software implementation of the OpenAL specification

http://kcat.strangesoft.net/openal.html

Chemical toolbox designed to speak the many languages of chemical data

https://openbabel.org/wiki/Main_Page

Small, fast, standards compliant, extensible window manager

http://openbox.org/

Open Crypto Development Kit

http://www.gnutls.org/

OpenCORE implementation of AMR Narrowband & Wideband speech codec

http://sourceforge.net/projects/opencore-amr/

Middleware framework for smart card terminals

https://github.com/OpenSC/openct

Open Source Computer Vision library

https://www.opencv.org/

Open Source Computer Vision library

https://www.opencv.org/

HBCI is a bank-independent homebanking standard

http://openhbci.sourceforge.net

Object-oriented SGML/XML parser toolkit and DSSSL engine

http://www.netfolder.com/DSSSL/