For sure you can create 3D graphs in GeoGebra - leading provider of dynamic mathematics software. It is important to know that GeoGebra is a free program. Next, perhaps you can try Veusz - a scientific plotting and graphing program with a graphical user interface, designed to produce publication-ready 2D and 3D plots. Veusz is Free Software too.
For sure you can create 3D graphs in GeoGebra - leading provider of dynamic mathematics software. It is important to know that GeoGebra is a free program. Next, perhaps you can try Veusz - a scientific plotting and graphing program with a graphical user interface, designed to produce publication-ready 2D and 3D plots. Veusz is Free Software too.