I’ve compiled ttk-1.4.0 for Mac OS X Darwin / Mountain Lion. Click the link at the bottom of the page for download.
For more information:
https://gforge.inria.fr/projects/ttk/
The Tensor Toolkit (TTK) is an extension of ITK (www.itk.org) to process diffusion tensor images and perform operations such as tensor estimation, smoothing, fiber tractography or statistical analysis.