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;
• Generation of polycrystals in non-convex domains;
• Generation of uniform orientation distributions;
• 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.

Installation instructions are provided in the documentation included in the distribution or available here.