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.
!! Update 2.5a for 3ds Max 2015 !!
You will find the full documentation (in pdf), the change_log and the plugin in the attached file (VoroFrag_v2.5.zip)