Package: vtk6

"vtk6" package binaries on Debian:

/usr/bin/vtk6 /usr/bin/vtkEncodeString-6.1 /usr/bin/vtkHashSource-6.1 /usr/bin/vtkParseOGLExt-6.1 /usr/bin/vtkWrapHierarchy-6.1

You may install this package on Debian with apt-get install vtk6