Gluplot

Gluplot- A data plotting package, handles both curves (2D) and surfaces (3D), including 2D plots styles, such as lines, points, lines with points, error bars and impulses. 3D surfaces are plotted as a colour map. Supports PostScript, Encapsulated PostScript (EPS) and Portable Document Format (PDF) output files. It can be use as standalone program and as C++ classes library.