Ymacs is an extensible AJAX text editor aimed for programmers. It's similar in spirit, features, and key bindings to Emacs: it supports multiple buffers, split frames, dynamic completion, multiple keymaps, and Emacs-like undo queue and kill ring. And of course, Emacs-like key bindings for all of that. It provides syntax highlighting and automatic indentation for a few programming modes, currently JavaScript, XML, CSS, and Lisp. Ymacs is based on the DynarchLIB AJAX toolkit and currently runs on Firefox (support for more browsers is planned). It's implemented in JavaScript and can be programmed in JavaScript as it's running.
