Python clone of WikiWiki

https://moinmo.in/

Mondulkiri Khmer fonts

https://sourceforge.net/projects/khmer/

Unix system management and proactive monitoring

https://mmonit.com/monit/

Meta-port for the default version of the Mono framework

https://www.mono-project.com/

Mono framework to create extensible applications

https://www.mono-project.com/Mono.Addins

VisualBasic.NET support for Mono

http://www.mono-project.com/VisualBasic.NET

Open source implementation of .NET Development Framework

https://www.mono-project.com/

Open source implementation of .NET Development Framework

https://www.mono-project.com/

Coding font with alternates, ligatures and contextual positioning

https://larsenwork.com/monoid

Monospace font

http://bok.net/MonteCarlo/

Sans-serif font inspired by the street signs of Montserrat

https://github.com/JulietaUla/Montserrat/

Drive a buggy across the moons surface

http://www.seehuhn.de/comp/moon-buggy

Open source MQTT broker

https://mosquitto.org/

Powerful text mode based programming IDE

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

Full-featured gopher server without dependencies

https://sourceforge.net/projects/motsognir/

Alphabet of geometric symbols based on 7x7 units

https://velvetyne.fr/fonts/mourier/

Simple text editor for the Xfce Desktop

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

Collection of open source fonts

http://www.theleagueofmoveabletype.com/

Improved JPEG encoder by Mozilla

https://github.com/mozilla/mozjpeg

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

Configurable tool to check collections of audio files

https://erislabs.net/ianb/projects/mp3lint/

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/

MPD client for GNUstep

https://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/

Skins for MPlayer's Graphical User Interface (GUI)

http://www.mplayerhq.hu/

Graphical Package Manager for MidnightBSD

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

Build platform for .NET and Visual Studio

https://github.com/Microsoft/msbuild

Efficient binary serialization, like JSON but smaller and faster

https://msgpack.org/

SMTP plugin for MUAs

https://marlam.de/msmtp/

Tools for manipulating MS-DOS disks and images

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

MTP device filesystem

https://www.adebenham.com/mtpfs/

Traceroute and ping in a single network diagnostic tool

https://www.bitwizard.nl/mtr/

Traceroute and ping in a single network diagnostic tool

https://www.bitwizard.nl/mtr/

Compositing window manager forked from Mutter for use with Cinnamon

http://cinnamon.linuxmint.com/

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/

Mustache text templates for modern C++

https://github.com/kainjow/Mustache

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