Gri is a language for scientific graphics programming. The word language is important: Gri is command-driven, not point/click. Some users consider Gri similar to LaTeX, since both provide extensive power in exchange for patience in learning syntax. Gri can make x-y graphs, contour graphs, and image graphs, in PostScript and (someday) SVG formats. Control is provided over all aspects of drawing, e.g. line widths, colors, and fonts. A TeX-like syntax provides common mathematical symbols.

WWW: http://gri.sourceforge.net/
