NRFit

Neutron and X-ray reflectivity analysis package (IgorPro/Wavemetrics Procedure):

1) Calculate neutron reflectivity based on the Parratt formalism.
2) Simple and easy to use.
3) Provide a number of functions for interfacial shape between layers.

Installation [IgorPro > 6.1(MAC), >5.x(WIN) required]:
Option1: Download anywhere on your computer and open_file/procedure from 'File' menu in IgorPro.
Option2: Download and copy it into Igor Procedures folder in IgorPro. It will show up in the menu.
Note: if it complains about FONT, select your favorite font and apply it to all experiments. First time users might also want to turn ON the ShowTips from Graph menu. Have IgorPro6.0MAC? Follow the NRfit link and browse the All files, and download the nrfit osx 6.0 version.

Downloads:
Download a proper version (window, mac) from the 'Browse all files' menu.