McXtrace is a general Monte Carlo ray-tracing software for simulation X-ray beamlines and experiments, distributed under the open source license of <a href="http://gnu.org/licenses/gpl.html">GPL</a>.
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Currently, the active partners behind the McXtrace project is <a
href="https://www.fysik.dtu.dk">DTU Physics</a> and <a href="https://www.synchrotron-soleil.fr/en">Synchrotron SOLEIL</a>.
McXtrace was started in 2009 as a collaborative effort between the <a
href="http://www.nbi.ku.dk">Niels Bohr Insitute</a>, <a
href="http://www.fysik.dtu.dk">DTU Physics</a>, <a
href="http://www.esrf.eu">European Synchrotron radiation Facility</a>
and partnering with the company SAXSLAB Aps (now part of Xenocs).
Initial funding came from a grant under the NaBiIT program of the Danish Strategic Research Council <a href="http://fi.dk/raad-og-udvalg/det-strategiske-forskningsraad" class="external text" title="http://fi.dk/raad-og-udvalg/det-strategiske-forskningsraad" rel="nofollow">DSF</a>.

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It is built upon the code base of the proven and succesful neutron ray-tracing package <a href="http://www.mcstas.org">McStas</a> and today McXtrace and McStas share a central code repository.

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A substantial amount of work has gone into creating this software package. If you enjoy it, and use it for your work please use this reference:
<ul>
  <li>
E&nbsp;Bergb&auml;ck&nbsp;Knudsen, Andrea Prodi, Jana Baltser, Maria Thomsen,
  P&nbsp;Kj&aelig;r&nbsp;Willendrup, M&nbsp;Sanchez&nbsp;del Rio, Claudio Ferrero, Emmanuel Farhi,
  Kristoffer Haldrup, Anette Vickery, et&nbsp;al.
 Mcxtrace: a monte carlo software package for simulating x-ray optics,
  beamlines and experiments.
 <em>Journal of Applied Crystallography</em>, 46(3):679-696, 2013.
 </li>
</ul>