MµCalc is software for calculating magnetic fields inside crystals, designed for making sense of µ+SR data.
Source code
The latest version of MµCalc is available on GitHub. It requires Python, and various libraries.
Documentation
Documentation is provided in the MµCalc wiki. Additional discussion of the theory of dipole field simulations can be found in Chapter 3 of my thesis.
Citation
If you make use of MµCalc in a publication, a citation of my thesis would be appreciated:
Andrew J. Steele, Quantum magnetism probed with muon-spin relaxation. DPhil. thesis, University of Oxford, 2011.