ngPlant is a Free Software project and you can download it from here.
The ngPlant modeling tool and ngpshot utility are distributed under the terms of the GNU General Public License (GPL).
The great part of this softwarecome for developers.
They can use 3D API-independent library to use generated plant
models in their 3D applications, or to create plant modeling plugins for
different 3D modeling tools.
Also the software libraries (libngpcore, libngput and pywrapper) which may be
used in another projects are distributed under the terms of the BSD License.