Our website provided a free download of PTMviewer 1.0 for Mac. The actual developer of this free software for Mac is Hewlett-Packard Development Company, L.P. The software is included in Design & Photo Tools.
From the developer:
Polynomial Texture Maps (PTMs) are a simple representation for images of functions instead of just images of color values. The PTMviewer simply evaluates this polynomial in real time independently for each pixel to produce an image. This can be done at real-time rates on even low-end computers.
You may want to check out more software for Mac, such as iPodEditor, OnTheAirCGServer or diggtop, which might be related to PTMviewer.