Create a shadow directory of symbolic links to another directory tree

https://gitlab.freedesktop.org/xorg/util/lndir/

Legacy locale data for FreeBSD 6+

Auditing tool for system logs on Unix boxes

https://salsa.debian.org/debian/logcheck

Receive/Send files via X/Y/ZMODEM protocol. (unrestrictive)

https://ohse.de/uwe/software/lrzsz.html

Lists information about open files (similar to fstat(1))

https://github.com/lsof-org/lsof

Small, compilable scripting language providing easy access to C code

https://www.lua.org/

Small, compilable scripting language providing easy access to C code

https://www.lua.org/

Just-In-Time Compiler for Lua

https://luajit.org/luajit.html

Locale and ISO 2022 support for Unicode terminals

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

Display the moon's phase

http://www.vector.co.jp/soft/dos/edu/se004823.html

Non-graphical, text-based World-Wide Web client

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

Lossless data compressor based on the LZMA algorithm

https://www.nongnu.org/lzip/

Portable speedy, lossless data compression library

https://www.oberhumer.com/opensource/lzo/

Fast file compressor similar to gzip, using the LZO library

https://www.lzop.org/

Data files for the m17n library

http://www.nongnu.org/m17n/

The m17n library documentation

http://www.nongnu.org/m17n/

Library for multilingual text handling

http://www.nongnu.org/m17n/

GNU M4

https://www.gnu.org/software/m4/m4.html

Bonjour (zero-configuration networking) by Apple

https://developer.apple.com/bonjour/ https://github.com/apple-oss-distributions/mDNSResponder

Madplay MP3 player (part of MAD project)

https://www.underbit.com/products/mad/

Magus runtime utilities for build cluster

Dependency generator for makefiles

https://www.x.org/archive/X11R7.5/doc/man/man1/makedepend.1.html

Perl scripts to assist in the generation and application of patches

https://www.vromans.org/johan/software/sw_makepatch.html

Convert man pages to HTML

https://man2web.sourceforge.net/

UNIX manual page editor and viewer

http://freecode.com/projects/manedit

Wrapper script for the various installations of Maven

Interpreter for the AWK Programming Language

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

Motherboard monitor for LM78/79, W8378x, AS99127F, VT82C686 and ADM9240

http://www.nt.phys.kyushu-u.ac.jp/shimizu/download/download.html

Lightweight Midnight Commander clone

http://mc.linuxinside.com/

Replacement for crypt(1)

https://mcrypt.sourceforge.net/

Converts CSV to MobileDB database

http://www.handmark.com/products/mobiledbtools/index.html

Alcohol 120% to ISO converter

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

Advertise a service via Rendezvous

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

The wiki engine used by Wikipedia

http://www.mediawiki.org/

High-performance distributed memory object cache system

https://memcached.org/

Utility to test for faulty memory subsystem

http://pyropus.ca/software/memtester/

Stand alone memory test for x86 architecture computers

http://www.memtest86.com/

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/

Metalink generation tool

http://metalinks.sourceforge.net/

Small, fast Emacs-like editor

https://github.com/ibara/mg

Module for additional features with X.Org/XFree86 Matrox driver

http://www.matrox.com/mga/support/drivers/previous/home.cfm

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

https://mhash.sourceforge.net/

MidnightBSD desktop environment

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

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

https://mikmod.sourceforge.net/

Construct and optionally send MIME messages from command line

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

MIME Media Types list

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

MS-DOS Telix serial communication program "workalike"

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

Program to create Compose cache files