NIRView unknown for Mac was available to download 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. The program belongs to Design & Photo Tools. This free Mac application is a product of Creative Comments Attribution Unported License.
From the developer:
NIRView is a full featured data visualization and segmentation application intended for the medical, scientific, and engineering research communities. NIRView can interactively render, reformat, annotate, measure, animate and capture / print volumetric and image data, all of which can be saved into a visualization session file for use at a later time.
You may want to check out more software for Mac, such as iPodEditor, OnTheAirCGServer or Flickr Widget, which might be similar to NIRView.