MGL - MathGL script.
script is textual file which contain commands for making scientific
graphics using MathGL library. Is is primarily designed for quick viewing or
processing data files as well as produce high-quality plots as output. MGL
support animation by defining special comments in file.
For a full description of MGL script language please see the MathGL manual.
Alexey Balakin http://mathgl.sourceforge.net/