Java project management tool, 3.x branch

http://maven.apache.org/

Java project management tool, 3.3.x branch

http://maven.apache.org/

Implementation of new/posix awk

http://invisible-island.net/mawk

Converts mbox mailboxes to Maildir

http://batleth.sapienti-sat.org/projects/mb2md/

SSL/TLS and cryptography library

https://tls.mbed.org/

Tool for buffering data streams

http://www.maier-komor.de/mbuffer.html

Midnight Commander, a free Norton Commander Clone

http://www.midnight-commander.org/

Lightweight Midnight Commander clone

http://mc.linuxinside.com/

Collects and decodes Machine Check Exception data

http://mcelog.org/

100% compatible replacement for Vixie cron

https://www.gnu.org/software/mcron/

Replacement for crypt(1)

http://mcrypt.sourceforge.net/

Utilities and libraries to export data from MS Access databases (.mdb)

http://mdbtools.sourceforge.net/

Alcohol 120% to ISO converter

https://BSDforge.com/projects/sysutils/mdf2iso/

Advertise a service via Rendezvous

https://github.com/Pro/mdnsd/

Open Source implementation of the Lotus Sametime protocol

http://meanwhile.sourceforge.net/

Wiki engine used by Wikipedia

http://www.mediawiki.org/

Wiki engine used by Wikipedia

http://www.mediawiki.org/

GNOME visual diff and merge tool

http://meldmerge.org/

High-performance distributed memory object cache system

https://memcached.org/

Stand alone memory test for x86 architecture computers

http://www.memtest86.com/

Library used to read freedesktop.org menus

https://lxde.org/

Advanced menu editor

https://bluesabre.org/projects/menulibre/

Menu generator for X Window Managers and desktop environments

http://menumaker.sourceforge.net/

Fast, lightweight source control management system

https://www.mercurial-scm.org/

OpenGL demos distributed with Mesa

https://www.mesa3d.org/

OpenGL hardware acceleration drivers for DRI2+

https://www.mesa3d.org/

Mesa Gallium XA state tracker

https://www.mesa3d.org/

OpenGL libraries that support GLX and EGL clients

https://www.mesa3d.org/

Customized version of the Apple Menlo font

https://github.com/andreberg/Meslo-Font

High performance build system

https://mesonbuild.com/

Window manager for the adult in you

Metalink generation tool

http://metalinks.sourceforge.net/

Implementation of MIME, the Multipurpose Internet Mail Extensions

Package for unstructured graph partitioning

http://glaros.dtc.umn.edu/gkhome/metis/metis/overview

Small, fast Emacs-like editor

https://github.com/ibara/mg

MgOpen greek fonts collection

http://ellak.gr/tag/fonts/

Easy-to-use library for strong hashes such as MD5 and SHA1

http://mhash.sourceforge.net/

WWW front end for mail archives

http://www.mhonarc.org/

MidnightBSD desktop environment

http://people.midnightbsd.org/~laffer1

MidnightBSD desktop environment

http://www.midnightbsd.org/

Lightweight web browser using WebKit browser engine

https://www.midori-browser.org/

Mod player which plays MTM, STM, XM, MOD, S3M, ULT, UNI and IT mods

http://mikmod.sourceforge.net/

Easy-to-use greylist milter for sendmail and postfix

http://hcpnet.free.fr/milter-greylist/

Construct and optionally send MIME messages from command line

http://www.argon.org/~roderick/

MIME Media Types list

http://packages.qa.debian.org/m/mime-support.html

Infiniminer/Minecraft inspired game

http://minetest.net/

The main game for the Minetest game engine

http://minetest.net/

Flash 4/5 movie output library with many languages support

http://www.libming.org/

MS-DOS Telix serial communication program "workalike"

https://salsa.debian.org/minicom-team/minicom/

Amazon S3 compatible object storage server

https://minio.io/