href="scooter.htm">SCOOTER</a> spectral integral (also know
        as wavenumber integration or the reflectivity method </li>
      <li><o:p><o:p><a href="bounce.htm">BOUNCE</a> calculation of a
            reflection coefficient for a stack of layers <o:p> </o:p></o:p></o:p></li>
      <li><a href="bellhop.htm">BELLHOP</a> Gaussian beam tracing and
        ray tracing code </li>
      <li><o:p><o:p><a href="sparc.htm">SPARC</a> A spectral integral
            code that operates directly in the time domain