Our neutron and X-ray reflectivity refinement package MOTOFIT has been made available for use by others, by means of an open-source licence.
MOTOFIT was written by Andrew Nelson at the Bragg Institute, and is a set of functions that aid the least squares fitting of specular X-ray and neutron reflectivity data, using Parratt's recursion formula.
It works within the analysis package IGOR Pro (Wavemetrics), and was created in version 5 of IGOR.