The DISCUS package consists of four programs, each of which could be used independently or in combination. The first program in the package is DISCUS itself and the development started some 15 years ago by Reinhard Neder. DISCUS is a general program to generate disordered atomic structures and compute the corresponding experimental data such as single crystal diffuse scattering or the atomic pair distribution function (PDF). Features include symmetry operations, Monte Carlo simulation capabilities and the generation of domain structure to name just a few. More recently DISCUS developments include the simulation of nanoparticles. DISCUS is the engine behind the new Nanoparticle Builder hosted by Los Alamos National Laboratory.
The second program is DIFFEV. This is a generic minimization program using an evolutionary algorithm. It is designed to work with the other programs in the package.
A new addition is the program MIXSCAT. It is a tool to extract differential pair distribution functions by combining x-ray and neutron data. The same differential functions can be calculated from a model using DISCUS.
Finally the package contains a general plotting program called KUPLOT.
Please note that the program PDFFIT has been retired. A completely rewritten version can be found at http://www.diffpy.org.