E (text editor)
E was one of the first WYSIWYG editors of the 1970s. Richard Stallman visited the Stanford Artificial Intelligence Lab in 1976 and was quite impressed by the feature. He implemented a similar hack to the TECO text editor once he returned to MIT in adding a combined display+editing mode called "Control-R"
- "Free as in Freedom (2.0), a biography of Richard M. Stallman" (PDF). Archived from the original (PDF) on 2012-05-01., GNU Press, 2010.