Scatty is a program for ultrafast calculation of diffuse-scattering patterns from atomistic models. The program was published in this paper. You can download it from this link.

Spinvert is a program for refinement of for refinement of atomistic models to powder magnetic diffuse scattering data for frustrated magnets, spin glasses, and other magnetically disordered materials. The program was published in this paper. You can download it from this link.