GLE is a graphics scripting language designed for creating publication quality figures such as charts, plots, graphs, and diagrams. It supports various chart types (including function plot, histogram, bar chart, scatter plot, contour plot, color map, and surface plot) through a simple but flexible set of graphing commands; more complex output can be created by relying on its scripting language, which is full featured with subroutines, variables, and logic control.

GLE relies on LaTeX for text output and supports mathematical formulae in graphs and figures. Output formats include (E)PS, PDF, JPEG, and PNG.