Library of complex numbers with arbitrarily high precision

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

MPD client for GNUstep

http://www.musicpd.org/MPDCon.shtml

C/C++ arbitrary precision decimal floating point libraries

https://www.bytereef.org/mpdecimal/index.html

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/

Graphical Package Manager for MidnightBSD

http://github.com/laffer1/mport-manager

Build platform for .NET and Visual Studio

https://github.com/Microsoft/msbuild

SMTP plugin for MUAs

https://marlam.de/msmtp/

A collection of tools for manipulating MSDOS files

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

Compositing window manager forked from Mutter for use with Cinnamon

http://cinnamon.linuxmint.com/

HTTP/FTP downloader with a nice GUI

http://multiget.sourceforge.net/

Authentication service for creating and validating credentials

https://dun.github.io/munge/

Common components between a munin node and server

https://munin-monitoring.org/

Contributed plugins and other for munin

https://github.com/munin-monitoring/contrib

Collector part of Munin

https://munin-monitoring.org/

Node-specific part of Munin

https://munin-monitoring.org/

Lightweight PDF viewer and toolkit

https://www.mupdf.com/

Decoder, encoder, and replaygain for musepack (mpc)

https://www.musepack.net/

Remote-controllable music daemon

https://www.musicpd.org/

Small but powerful text based program for read/writing e-mail

http://www.mutt.org/

Window and compositing manager based on Clutter

https://gitlab.gnome.org/GNOME/mutter

PHP-based bulletin board / discussion forum system

https://mybboard.net/

Fast painting/scribbling program

http://mypaint.org/

Brushes used by MyPaint and other software using libmypaint

https://github.com/mypaint/mypaint-brushes

Brushes used by MyPaint and other software using libmypaint

https://github.com/mypaint/mypaint-brushes

MySQL Connector/J: JDBC interface for MySQL

https://dev.mysql.com/downloads/connector/j/

MySQL Connector/J: JDBC interface for MySQL

https://dev.mysql.com/downloads/connector/j/

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/

Multithreaded SQL database (client)

https://www.mysql.com/

Multithreaded SQL database (server)

https://www.mysql.com/

Multithreaded SQL database (client)

https://www.mysql.com/

Multithreaded SQL database (server)

http://www.mysql.com/

Assist you with MySQL Configuration

https://github.com/major/MySQLTuner-perl

Simple thesaurus library

http://hunspell.github.io/

Powerful network monitoring system

https://www.nagios.org/

Plugins for Nagios

https://www.nagios-plugins.org/

Powerful network monitoring system

https://www.nagios.org/

Nano's ANOther editor, an enhanced free Pico clone

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

Small weblog engine written in Bash for the command line

http://nanoblogger.sourceforge.net/

Socket library that provides several common communication patterns

https://nanomsg.org/

Network Audio System

http://radscan.com/nas.html

General-purpose multi-platform x86 and amd64 assembler

https://www.nasm.us/

File manager for the GNOME desktop

https://wiki.gnome.org/Apps/Nautilus

Nauty & Traces are programs for computing graph automorphism

https://pallini.di.uniroma1.it/