Powerful text mode based programming IDE

http://konst.org.ua/motor/

Simple text editor for the Xfce Desktop

https://git.xfce.org/apps/mousepad/about/

Mouse accessibility enhancements for the GNOME desktop

https://launchpad.net/mousetweaks/

PostScript printing util for ASCII files, email, USENET news articles, etc

Library and tools to read, create, and modify mp4 files

http://mp4v2.org/

External MIME packer/unpacker

Library of complex numbers with arbitrarily high precision

https://www.multiprecision.org/mpc/

MPEG-2 Encoder and Decoder

http://www.mpeg.org/MPEG/video/mssg-free-mpeg-software.html

Library for multiple-precision floating-point computations

https://www.mpfr.org/

Command-line player for MPEG Layer 1, 2, and 3 audio files

http://www.mpg123.de/

High performance media player supporting many formats

http://www.mplayerhq.hu/

Skins for MPlayer's Graphical User Interface (GUI)

http://www.mplayerhq.hu/

SMTP plugin for MUAs

https://marlam.de/msmtp/

Tools for manipulating MS-DOS disks and images

https://www.gnu.org/software/mtools/intro.html

Common components between a munin node and server

https://munin-monitoring.org/

Collector part of Munin

https://munin-monitoring.org/

Node-specific part of Munin

https://munin-monitoring.org/

Convert a MySQL dump to a PostgreSQL dump

http://pgfoundry.org/projects/mysql2pgsql/

Multithreaded SQL database (client)

http://www.mysql.com/

Multithreaded SQL database (scripts)

http://www.mysql.com/

Multithreaded SQL database (server)

http://www.mysql.com/

Multithreaded SQL database (client)

http://www.mysql.com/

Multithreaded SQL database (server)

http://www.mysql.com/

Multithreaded SQL database (client)

http://www.mysql.com/

Multithreaded SQL database (server)

http://www.mysql.com/

Simple thesaurus library

http://hunspell.github.io/

Nano's ANOther editor, an enhanced free Pico clone

https://www.nano-editor.org/

Small weblog engine written in Bash for the command line

http://nanoblogger.sourceforge.net/

Network Audio System

http://radscan.com/nas.html

General-purpose multi-platform x86 and amd64 assembler

https://www.nasm.us/

Brian Kernighan's pattern scanning and processing language

http://cm.bell-labs.com/cm/cs/awkbook/index.html

FTP client with advanced user interface

https://www.ncftp.com/ncftp/

Commercial FTP daemon with a 30-day evaluation license

http://www.ncftp.com/ncftpd/

Library for terminal-independent, full-screen output

https://invisible-island.net/ncurses/

HTTP and WebDAV client library for Unix systems

https://notroj.github.io/neon/

Extendable SNMP implementation

http://net-snmp.sourceforge.net/

File server for Mac OS X

http://netatalk.sourceforge.net/

Modular, standards-based integrated development environment

https://netbeans.apache.org/

Simple utility which reads and writes data across network connections

http://nc110.sourceforge.net/

Objective-C framework for socket programming with GNUstep

http://gap.nongnu.org/talksoup/

Network benchmark

http://www.ars.de/ars/ars.nsf/docs/netio/

Toolkit for conversion of images between different formats

http://netpbm.sourceforge.net/

Network performance benchmarking package

https://hewlettpackard.github.io/netperf/

Self-scaling network benchmark

http://bitspjoule.org/netpipe/

Low-level cryptographic library

https://www.lysator.liu.se/~nisse/nettle/

Implementation of AT&T Research UNIX V8 newer(1)

Download news articles from NNTP server

Not Eriks Windowing Toolkit: console I/O handling library

https://pagure.io/newt

Classic Go game for OPENSTEP/GNUstep

https://www.nongnu.org/gap/nextgo/index.html

HTTP/2.0 C Library

https://nghttp2.org/