Source : Free On-Line Dictionary of Computing

groff
     
        GNU roff.
     
        {GNU}'s implementation of {roff} in {C++}.
     
        See also {nroff}, {troff}.
     
        Version 1.07 by James J. Clark .
     
        FTP groff-1.07.tar.z from a {GNU archive site}.
     
        (1993-03-03)