(If you use XEmacs, then you might find the Maude mode for XEmacs written by Kai Brünnler or the Maude mode written by Ellef Gjelstad useful. Extract the mode using the command "gunzip -c maude-mode.tar.gz | tar -xvf -" and follow instructions in maude-mode/README. Note that the Maude mode does not run under GNU Emacs. If you are using Emacs 24 please consider to use the maude-mode written by Santiago Saavedra. Please see the README for details. There are also language packages for Atom, Visual Studio Code, and other editors.