AutoCAD has a simultaneous GUI and CLI. SketchUp has a partial implementation of a similar model. You could argue that Vi and emacs do both. Certainly the prim

AutoCAD has a simultaneous GUI and CLI. SketchUp has a partial implementation of a similar model. You could argue that Vi and emacs do both. Certainly the primary mode is a (curses-based) GUI, and the command modes operate on the same data. They're not quite always-on, but close enough. I often wish more applications would do this!