GLE is a graphics language that produces PostScript, EPS, PDF, PNG,
or JPG ouput from a simple script file.

GLE is a full featured scripting language that includes variables,
subroutines, logic control, looping, a graphing tool, and more
to produce high quality output. It has a full range of facilities
for producing publication-quality graphs, diagrams, posters and slides.
GLE provides LaTeX quality fonts together with a flexible graphics
module, which allows the user to specify any feature of a graph
(down to the line width of the subticks, for example).

WWW: http://www.gle-graphics.org/