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Emacs is an advanced, self-documenting, customizable, extensible real-time display editor. Emacs was written by Richard Stallman of the Free Software Foundation. Emacs is mostly written in Lisp, with some C for efficiency.
Emacs is WYSIWYG (what you see is what you get), updated frequently, has features like text filling, auto-indent, viewing 2+ files, deals with characters, words, lines, paragraphs, sentences, pages. The user can change the definitions, rearrange the command set, and create new commands (programs in Lisp) online (don't need to create a new version).
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