Z-mat is NW Numerics’ primary software product we sell and develop, in collaboration with the larger Z-set development group. The library provides advanced consitutitive models in a flexible framework for a multitude of material types and model approaches. The material model library is standard with the Zebulon FEA solver on all common UNIX and Win32 platforms, and as an extension to other commercial codes supporting a user material interface (see availability below). Some topics which may be of interest are: Overview of the library; New Features; Material models; Global solution methods (cycle skip); Material files; ABAQUS interface; ANSYS interface; User extensions; ZebFront and Z-mat; Optimizer; Simulation.