3D Grapher is a powerful but easy-to-use graphing software. It will help you create full-color animated 2-D and 3-D graphs and manipulate them. You can specify an unlimited number of equations which can be plotted using different colors and lighting conditions. Functions can be parametric and can include a time variable for animation. All plots can be in either Cartesian, cylindrical or spherical coordinates. Surface plots can be solid or not and if solid they can be shaded or not. The presentation-quality graphs may also be copied and pasted into you own documents. Additional features include built-in expression calculator and completely customized interface.