PLOTICUS is a command line utility for creating
bar, line, pie, boxplot, scatterplot, sweep,
heatmap, vector, timeline, Venn diagrams, and other types of charts and plots.
ploticus is good for automated or
just-in-time graph generation. It handles date,
time, and categorical data nicely, and has some
basic statistical capabilities. It can output to
GIF, PNG, SVG, SWF, JPEG, PostScript, EPS, and
X11. You can use convenient preset options or
create complex scripts with rich and detailed
color and style operations.