Visual Fitting is a System Utilities software developed by GraphNow. After our trial and test, the software was found to be official, secure and free. Here is the official description for Visual Fitting: Use Visual Fitting to implement linear, nonlinear curve fitting and graphing. 1. A global optimistic method is used, so the result will not be "Failed" and local optimistic. Initial start values of the parameters can be free random ones. 2. Implement curve fitting and graphing of linear models. 3. Implement curve fitting and graphing of nonlinear models. 4. Implement surface fitting and graphing of any binary function models. 5. Volume fitting and graphing of any trinary function models. 6. Unary, binary and trinary polynomial fitting and graphing. 7. High quality 2d curves, 3d surfaces and 4d volume slices can be created to visualize the fitting models. you can download Visual Fitting free now.