.. include:: autodoc_abbr_options_c.rst .. _`sec:interfacing`: Interfaces: Enhancing |PSIfour| Capabilities ============================================ |PSIfours| capabilites have been expanded by interfacing with other software packages. These programs aren't necessary for |PSIfour| to operate and may require additional licences, special platform capabilities, *etc*. * :ref:`sec:mrcc` |PSIfour| can drive the MRCC program of M. K\ |a_acute|\ llay and J. Gauss * :ref:`sec:dftd3` |PSIfour| can drive the DFTD3 program of S. Grimme for DFT-D3 energies and gradients * MPI4Py * MADNESS * MATLAB for new dft functionals .. toctree:: :maxdepth: 2