Em

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 "Editor for Mortals"

 Author:   [George Coulouris]
 History:  http://www.dcs.qmul.ac.uk/~gc/history/index.html
 Man Page: http://www.eecs.qmul.ac.uk/~gc/history/QMC_Unix_manual.html
 Source:   http://www.dcs.qmul.ac.uk/~gc/history/emsource/em1.c
 Family:   ViFamily
 Platform: PDP-11 
 License:  Commercial

Em was a modified version of Ken Thompson's ed editor for Unix, intended for screen editing.

Em was a direct predecessor of VI.