MudOS is a major family of LPMud

LPMud

LPMud, abbreviated LP, is a family of MUD server software. Its first instance, the original LPMud game driver, was developed in 1989 by Lars Pensjö...

 server software, implementing its own variant of the LPC programming language. It first came into being on February 18, 1992. It pioneered important technical innovations in MUD

MUD

A MUD , pronounced , is a multiplayer real-time virtual world, with the term usually referring to text-based instances of these. MUDs combine elements of role-playing games, hack and slash, player versus player, interactive fiction, and online chat...

s, including the network socket support that made InterMUD

InterMUD

InterMUD or interMU* communications is the commonly accepted terminology for different methods of allowing MUDs to communicate with each other. Some of the more common of these methods are custom protocols over the internet, IPC messages, and bots. The custom protocol method, which is by far the...

 communications possible and LPC-to-C compilation. Its name reflects its focus on separation of concerns

Separation of concerns

In computer science, separation of concerns is the process of separating a computer program into distinct features that overlap in functionality as little as possible. A concern is any piece of interest or focus in a program. Typically, concerns are synonymous with features or behaviors...

 between game driver and mudlib

Mudlib

A mudlib, short for mud library, is a library of code forming part of the technical infrastructure of a MUD. Though different varieties of MUD may be considered to have mudlibs, the term is most often used with LPMuds. In an LPMud, the mudlib consists of interpreted code written in the LPC...

. FluffOS is Discworld MUD

Discworld MUD

Discworld MUD is a popular MUD, a text-based online role-playing game, set in the Discworld as depicted in the Discworld series of books by Terry Pratchett.-History:...

's fork of MudOS.

Mudlib

Mudlib

A mudlib, short for mud library, is a library of code forming part of the technical infrastructure of a MUD. Though different varieties of MUD may be considered to have mudlibs, the term is most often used with LPMuds. In an LPMud, the mudlib consists of interpreted code written in the LPC...

s written for MudOS include the Nightmare Mudlib

Nightmare Mudlib

The Nightmare Mudlib is a set of LPC programming language frameworks created by George Reese for building multi-user role playing games using the MudOS LPMud driver...

, the Lima Mudlib

Lima Mudlib

The Lima Mudlib is an LPC framework for building multi-user role playing games. It was originally written for the MudOS game driver by Zachary "Zakk" Girouard, Tim "Beek" Hollebeek, Greg "Deathblade" Stein, and John "Rust" Viega...

, the TMI Mudlib

TMI Mudlib

The TMI Mudlib from The Mud Institute was an attempt to create a framework driven mudlib for the MudOS LPMud driver. It consisted of many contributors to MudOS as well as people who became influential in the LPMud community. When TMI began work in 1992, a mudlib was generally packaged with both an...

, and the LPUniversity Mudlib

LPUniversity Foundation

The LPUniversity Foundation was an umbrella community project founded on April 2, 2005 by C.A. Wayne "Tacitus" Somerville that aspired to revive the LPC community through offering community driven services, offering mutual location for education, research, development, discussion and certification,...

.

Notable MudOS-based MUDs include Accursed Lands

Accursed Lands

Accursed Lands, abbreviated AL, was a MUD, a text-based online role-playing game, founded in 1996 and operating until 2011. It was an early example of the "Roleplay Intensive MUD", or RPIMUD, style of game.-Setting:...

, Costello

Costello (online game)

Costello is an educational MUD — a text-based online role-playing game — designed for teaching English as a foreign or second language. It is offered online as a free service...

, Nightmare LPMud

Nightmare LPMud

Nightmare LPMud, founded in 1992, was one of the oldest continually running LPMuds still played until its closure on September 12, 2005. Its roots go back to the original LPMud, Genesis LPMud, when Forlock of Genesis along with some students at Bates College in Lewiston, Maine founded Orlith in 1991...

, Nuclear War MUD

Nuclear War MUD

Nuclear War MUD, abbreviated Nuke, is a MUD, a text-based online role-playing game, founded in 1992.-Game characteristics:The MUD is set in a post-apocalyptic world with cyberpunk elements. Civilization has been destroyed by a nuclear holocaust — hence the name of the MUD...

, and The Two Towers

The Two Towers (MUD)

The Two Towers, or T2T, is an MUD, a text-based multiplayer online role-playing game, set in Tolkien’s universe at the time of events in the third volume of Tolkien's The Lord of the Rings.-Description:...

. Genocide

Genocide (online game)

Genocide is a MUD, a text-based online game, focused exclusively on player-killing. Founded in 1992, it was influential as the first such "pure PK" MUD, and has met with positive critical response.-Game characteristics:...

was an important development testbed for MudOS from 1992 to 1994, but switched back to the main LPMud branch, citing speed concerns. Nanvaent

Nanvaent

Nanvaent, or NANVAENT, is a MUD based in the UK. Stylistically it is Medieval or Tolkienesque. It is one of the longest-running LPMuds.-Overview:...

ran on MudOS at one time, though it has since ported to FluffOS.