Function Grapher is a System Utilities software developed by GraphNow. After our trial and test, the software was found to be official, secure and free. Here is the official description for Function Grapher: Function Grapher is an easy-to-use software to create 2D, 2.5D, 3D and 4D function graphs, animations and table graphs. 2D Features: explicit, implicit, parametric, and inequality; Cartesian and polar coordinate systems; curve and animation; line plot; scatter plot; stem plot; step plot; curve smoothing. 3D Features: cartesian, cylindrical, and spherical coordinate systems; 3D curve and surface; animation; 3D surface based on table data; material and light. Ability to create color map, contour plot and vector plot. Ability to move, zoom in, zoom out and rotate graphs. Ability to save graphs as pgp file or bmp file. Ability to save animation as AVI file. you can download Function Grapher free now.