Neper is distributed as a free / open-source software, under the terms of the GNU General Public License (GPL). In short, this means that everyone is free to use Neper and to redistribute it on a free basis. Neper is not in the public domain; it is copyrighted and there are restrictions on its distribution (see the license and the related FAQ).

It you use Neper for your own work, please mention it explicitly and cite one or several of the papers given in the References section below. The papers are available for download.

Current official release

Development repository

The development version is hosted on GitHub: This is also the place for code contributions, see the community page.

Supplementary software


  • Romain Quey, Paul Dawson and Fabrice Barbe, Large-scale 3D random polycrystals for the finite element method: Generation, meshing and remeshing, Comput. Methods Appl. Mech. Engrg., vol. 200, pp. 1729-1745, 2011: paper
  • Romain Quey and Loïc Renversade, Optimal polyhedral description of 3D polycrystals: Method and application to statistical and synchrotron X-ray diffraction data, Comput. Methods Appl. Mech. Engrg., vol. 330, pp. 308-333, 2018: postprint link
  • Romain Quey, Aurelien Villani and Claire Maurice, Nearly uniform sampling of crystal orientations. J. Appl. Crystallogr., vol. 51, pp. 1162-1173, 2018. reprint link