VoroFrag is a free modifier that allows to make voronoi fragmentation. It handles convex and concave objects, as well as hollow meshes and open surfaces. It offers a "Box Mode" for quick fragmentation. Support for mapping coordinates, material ID and normals.
Recompiled for 3DS Max version 2017 to 2021
You will find the full documentation (in pdf), the change_log and the plugin in the attached file