Octaviz is a visualization system for Octave. It is a wrapper that makes all VTK classes accessible from within Octave using the same object-oriented syntax as in C++ or Python. Octaviz also provides high-level functions for 2D and 3D visualization. Using those functions, most common visualization tasks (3D surface plots, contour plots, meshes etc) can be accomplished without any knowledge about VTK.
Although Octaviz is in active development, it already quite usable and stable. All major features of the wrapper are implemented: all VTK classes are wrapped, array exchange between Octave and VTK works, callbacks work and finally there is experimental CygWin support. Excluding language specific constructs, Python examples (included in VTK) can be used in octave without any modification. To help you get started, about 70 Python examples are converted to Octave and included in Octaviz.