Function Grapher and Visual Calculus have the ability of creating 3D Cartesian graphs. The function of 3D Cartesian coordinate graph can be in one of the following forms
The following figure shows 3D Cartesian graphs of function z=sin(x)*sin(y) and function z=x^2+y^2.
Cylindrical coordinate graphs
Spherical coordinate graphs
Math Software -> Graph Function (Graph Calculus) -> 3D Cartesian Coordinate Graphs