MUD server, based on BylinyMUD codebase (BylinyMUD - russificated MUD, based on CircleMUD).
Server is platform independent, maked in Linux (Debian, Centos, Ubuntu), FreeBSD, Windows
github: https://github.com/Zerkalo-MUD/mud/
A multi-user user-extensible environment for exercising chatting and creative skills. Derived from TinyMUD 1.4.1 beta. Code active since Jan 30, 1990. The development site is online at telnet:uglymug.org.uk:6239
NAGS (Not Another Game Server) is a core system for creating a talker or mud, the code base uses object orientated PHP with a SQL database backend (MySql, Sqlite, Oracle) to track users, room, objects and npc's.