MathViz allows you to visualize any function of two variables y=f(x,z) in brilliant colors. There are a couple of pre-built functions, and you can add your custom function and visualize it. You can rotate around all 3 axis (X, Y and Z) as well as zoom in and out using the controls. Powered by TExpressionParser - a flexible and fast expression parser for logical and mathematical functions by Egbert van Nes, with contributions by John Bultena and Ralf Junker.