E (1970s text editor)
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E is a text editor originally developed at the Stanford AI Lab in the 1970s for the WAITS operating system.[1]
E was one of the first WYSIWYG editors. Richard Stallman visited the Stanford Artificial Intelligence Lab in 1976 and was impressed by this technology. Carl Mikkelsen had previously implemented a similar hack to the TECO text editor, adding a combined display+editing mode called "Control-R".[2]