   </blockquote>
      </dd>

      <dt><a href="http://cctbx.sourceforge.net"><b>cctbx - Computational
      Crystallography Toolbox</b></a></dt>

      <dd>
        Computational Crystallography is concerned with the derivation of
        atomic models of crystal structures, given experimental X-ray
        diffraction data. The cctbx is an open-source library of fundamental
        algorithms for crystallographic computations. The core algorithms are
        implemented in C++ and accessed through higher