The Free On-line Dictionary of Computing (30 December 2018):

Gnuplot

    A command-driven interactive graphing program.  Gnuplot
   can plot two-dimensional functions and data points in many
   different styles (points, lines, error bars); and
   three-dimensional data points and surfaces in many different
   styles (contour plot, mesh).  It supports complex arithmetic
   and user-defined functions and can label title, axes, and data
   points.  It can output to several different graphics file
   formats and devices.  Command line editing and history are
   supported and there is extensive on-line help.

   Gnuplot is copyrighted, but freely distributable.  It was
   written by Thomas Williams, Colin Kelley, Russell Lang, Dave
   Kotz, John Campbell, Gershon Elber, Alexander Woo and many
   others.  Despite its name, gnuplot is not related to the GNU
   project or the FSF in any but the most peripheral sense.  It
   was designed completely independently and is not covered by
   the General Public License.  However, the FSF has decided
   to distribute gnuplot as part of the GNU system, because it
   is useful, redistributable software.

   Gnuplot is available for: Unix (X11 and NEXTSTEP),
   VAX/VMS, OS/2, MS-DOS, Amiga, MS-Windows,
   OS-9/68k, Atari ST and Macintosh.

   E-mail: .

   FAQ - Germany
   (http://fg70.rz.uni-karlsruhe.de/~ig25/gnuplot-faq/), UK
   (ftp://src.doc.ic.ac.uk/usenet/news-info/comp.graphics.gnuplot),
   USA

(http://cis.ohio-state.edu/hypertext/faq/usenet/graphics/gnuplot-faq/faq.html).

   Usenet newsgroup: news:comp.graphics.gnuplot.

   (1995-05-04)