Functor is a mathematical application which allows you to graph 3D algebric functions, such as z = f(x, y). The program uses the OpenGL hardware acceleration (if available), and supports perspective and orthogonal projection methods, as well as wireframe, Web, and solid-view modes. It can also handle free color choices and light sources. Functor includes a graphics scan function, and a plane spectrum analysis, and can easily work with partially defined functions. You can enter the function in normal algebric style, and include floating point numbers in most numerical data fields, as well as complete constant expressions. In addition, you can easily save and load your functions.