tomviz 1.1.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free Mac app was originally produced by Kitware, Inc. Tomviz for Mac lies within Design & Photo Tools, more precisely 3D Modeling.
From the developer:
Tomviz is a cross platform, open source application for the processing, the visualization, and the analysis of 3D tomographic data. Here the full pipeline of data processing steps from reconstruction to visualization to analysis of 3D data can be presented, saved, and restored. A suite of Python tools for 3D analysis is packaged to accommodate custom algorithms.
The Tomviz application is tailored for visualizing electron tomography data.
You may want to check out more Mac applications, such as Argon v8 SP2, TkMatMan or 3D Invigorator PS, which might be similar to tomviz.