Py3DN
Morphometric analysis and visualization of the 3D structure of neurons
... and uses Blender (an open source program) to produce detailed 3D representations of raw and processed data.
Py3DN is described in the paper:
Aguiar P et al, "Versatile morphometric analysis and visualization of the three-dimensional structure of neurons", Neuroinformatics, 2013, 11(4):393-403
doi: 10.1007/s12021-013-9188-z