3D Grapher - description from Softdepia.com:
3D Grapher is a powerful but easy-to-use graphing software. It will help you create animated 2D and 3D equation and table-based graphs. You can read information and news of the product, download a full-functional trial version and register it, if you like the program and wish to use it after the evaluation period. You can also view the graphs gallery (several interesting graphs plotted with the help of 3D Grapher).
3D Grapher is a "Free to try" program. You can download and try it for an evaluation period.