Neper
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Neper is a software package for polycrystal generation and meshing. It
can deal with 2D and 3D polycrystals with very large numbers of grains.
Its main features are:

- Generation of polycrystals from (experimental) morphological
  properties;
- Generation of multiscale microstructures;
- Generation of periodic or semi-periodic microstructures;
- Meshing into good-quality elements;
- Meshing with cohesive elements at interfaces;
- Visualization and analysis of the tessellations and meshes.

Neper is built around three modules: generation, meshing and
visualization. All the input data are prescribed non-interactively,
using command lines and / or ASCII files. Neper can be compiled and
run on any Unix-like system.