KildClient is a powerful MUD client with a built-in Perl interpreter
KildClient is a mud client using the GTK toolkit. Its main feature is the support of Perl scripting. Other standard features of mud clients (triggers, gags, macros, etc.) are also supported.
Project Angela is a family of ruleset modeling language (RML) interpreter components written in python. It is intended to easily enable RML support for a variety of different simulation engines, game engines and MMO frameworks.
Lich is a cross-platform multithreaded interpreter meant exclusively for use with text-based MUDs. The application natively supports the Ruby language as well as the Simutronics "Wizard" script standard including their StormFront expansions.