Curve Fitter is a practical application that allows you to visualize and to fit data imported from CSV files. The program allows you to edit the data that you want to fit by manually selecting and deleting the points that you want to exclude.
You can examine a certain fragment from the data file by browsing the raw data or by selecting a part of the generated plots. The program also includes a scripting console program that allows you to access all the data fitting and visualization tools.
Note: The program can be used for free but only for non-commercial purposes.