EXPGUI is a graphical interface for the Los Alamos GSAS package.
GSAS (General Structure Analysis System) is a comprehensive system for the refinement of structural models to both x-ray and neutron diffraction data.
More info on GSAS+EXPGUI, and how to download and install, can be found at the
EXPGUI version tracking web site
Pease include a reference to GSAS and/or EXPGUI in publications making use of the software.
A.C. Larson and R.B. Von Dreele, "General Structure Analysis System (GSAS)",
Los Alamos National Laboratory Report LAUR 86-748 (2000).
[link to PDF copy of manual]
B. H. Toby, 'EXPGUI', a graphical user interface for GSAS,
J. Appl. Cryst. 34, 210-213 (2001).
[link to PDF version of paper]