Checking using my development versions:

• model maker does not load on Mac OS X Darwin, but does load on Linux64, win32
  On Mac:
  ModelMaker is not a plugin (timeout exceeded).
  responds to --xml from inside Slicer3 tcl term, but no shared plug in got built

• Probe Volume with Model (Paint) loads on linux64 and win32, but not Mac OS X Darwin

• Diffusion Tensor Estimation and Diffusion Tensor Scalar Measurements load on win32 and linux64, not Mac OS X Darwin

• Label Statistics loads on Win32, not linux64 or Mac OS X Darwin

• Orient Images loads on win32 and Mac OS X Darwin, not linux64

• Execution Model Tour doesn't load on Mac OS X Darwin, does on linux64 and win32

• ROI Select doesn't load on Mac OS X Darwin, does on linux64 and win32

• Linear registration doesn't load on Mac OS X Darwin, does on linux64 and win32
  List of all models exceeds my screen height on linux64 and there's no way to scroll the list, it should get broken into columns.

In the categorised list, under Tractography, on win32 and Mac OS X Darwin, Stochastic Tractography Filter appears in the Seeding subcat, but it appears under the Stochastic subcat on linux64