Mudlet
Mudlet is a MUD client that is available for Windows, Mac, and Linux and can be downloaded from https://www.mudlet.org/.
UI
Threshold has an unofficial, if useful, UI package that can be installed from within game. You can find more information on the Mudlet gui article.
Common configuration changes
Do not keep last input
Tell Mudlet to not keep the last input in your input bar by going to Settings > Input Line and ✅checking Auto clear the input line after you sent text.
Do not highlight input history text
Tell Mudlet to NOT highlight your command history text as you scroll through it by going to Settings > Input Line and ❎unchecking Highlight history.
Enable UTF-8
Most of the time, the server should tell Mudlet to enable UTF-8, but if it doesn't, you can do it manually by going to Settings > General and modifying the setting Server data encoding to UTF-8 (Recommended)
To determine if UTF-8 is working, in-game, type help utf8 and you should see some fancy rune characters that look like ᚻᛖ ᚳᚹᚫᚦ ᚦᚫᛏ ᚻᛖ ᛒᚢᛞᛖ ᚩᚾ ᚦᚫᛗ ᛚᚪᚾᛞᛖ ᚾᚩᚱᚦᚹᛖᚪᚱᛞᚢᛗ ᚹᛁᚦ ᚦᚪ ᚹᛖᛥᚫ.