LegendWeaver is an up-and-coming MUD client. It's currently in its developmental stages though, so bugs -do- exist. Its features include:

• Full scripting support including nested if and loop statements, variable manipulation, mathematical functions, and array searching.
• Variable support, including arrays
• Basic Trigger, Alias, and Macro support.
• Supports MSP! (MSP 0.3 compliant)
• Basic ANSI colour support.