orthos
Simulation of EPR spectra of nitroxide biradicals
...The program capabilities include simulation of rigid-limit and slow-motional spectra, of both isotropic and aligned samples. The spectra of multiple paramagnetic species, both bi- and monoradicals can be modeled.
NB: Please note that now (as of Nov 2016) the distribution is being updated so that to improve reliability, OS-universality, and the quality of documentation. If you have any troubles installing/compiling/using the software, please contact me. I would be glad to help.