Blightmud
Blightmud is an open source terminal mud client, written in Rust.
It supports most modern MUD features, such as GMCP, MCCP and MSSP and has Lua scripting with triggers, aliases, etc. Similar to TinyFugue, it might be a better fit to more technically minded users than to those who just want a simple to use client.
Installation instructions, documentation and more from project Github page.