Full version. How to activate : when you click on the item "plot funtion 3D" , it will ask for internet access , just deny it . And in the subseqent window , just enter any random number , that's it ! Now you can start plotting functions in 3D ! Well, GraphViewer is a graphical calculator With GraphViewer you can plot 2D equations , 3D equations. using the build-in functions, calculate its derivate, show a table with the functions critical points and even many more features.