PyImfit includes library code from the following open-source projects:

   - FFTW3, licensed under version 2 of the GNU Public License;
   source code avaliable at http://www.fftw3.org

   - GSL (GNU Scientific Library), licensed under version 3 of the GNU Public License;
   source code available at http://www.gnu.org/software/gsl

   - NLopt, licensed under the GNU Lesser General Public License;
   source code available at https://github.com/stevengj/nlopt