Fire Client - 1.49 

Fire Client will connect to any host on any port especially a MUD. Its mfeature is the ability to display a scrolling HTML stream when IMP (Interactive Mudding Protocol) is enabled. Versions understand bold, italic, underline, strikethru, bullets, and alignment TAGS. It can also read the font FACE, SIZE, and COLOR attributes for a more interesting chat or mudding experience.

MuckClient - 2.11 

Features: Multi session, font/color changes, log files, upload commands, color, sessions, auto-login to specified worlds, load/save macros, command history, muck recording, scrollback for sessions - back to beginning of session (limited by size of memory only), session naming, settings saved and auto-update.

MUSHclient - 2.15 

MUSHclient is a fast MUD/MUSH/MUCK (etc.) client that has 100,000-line scrollback buffer, remembers the last 5,000 commands entered (can be recalled sequentially or by searching), and includes aliases, triggers, timers, keypad-navigation, speed-walking, auto-say, scripting, ANSI color-support, user-defined font and size, user-defined macros, logging, copy-and-paste, and printing. MUSHclient allows multiple worlds to be opened at once. It is highly configurable and easy to use.

Portal - 5.0a 

The latest evolution in MUD clients, Portal provides all the features you expect and adds many that you have wanted. Events, timed actions, aliases, nicknames, macros, variables with a robust programming language, status and message bars or floating windows, image and sound support, and a built in cartographer to map your way around your favorite virtual world.