Gnuplot 5.4 has been released,
three years after the last major release of the free-software
graphing program.
In this article we will take a look at five major new capabilities in gnuplot.
First, we briefly visit voxel plotting, for visualizing 3D data. Since this is
a big subject and the most significant addition to the program, we’ll save the details
for a subsequent article. Next, we learn about plotting polygons in 3D, another completely
new gnuplot feature. After that, we’ll get caught up briefly in spider plots, using them
to display some recent COVID-19 infection data. Then we’ll see an example of how to
use pixmaps, a new feature allowing for the embedding of pictures alongside curves or
surfaces. Finally, we’ll look at some more COVID-19 data using the new 3D bar chart.

Source: LWN.net – [$] New features in gnuplot 5.4