These are not directly integrated to VTK, but might be useful in specific context. If you are using such additional tools in your daily work, then other users might need them too.
(S. Barré, UTC) "dicom2 is a free command-line driven program which allows you to convert medical images and DICOM files to various other formats, while optionally performing some rudimentary image processing tasks... It is not a script, but I've written a section to describe how to convert sets of medical images to a raw format that might be read by VTK."
(K. M. Syring) "This is a partial implementation of a COM (Ole) wrapper for the C++ classes of the VTK visualization library . It is intended primarily for use with Visual Basic 5/VBA. Some stuff is still missing and some functions are not working as expected."
(B. Sherman) "quick3D is a program intended to be used as a quick viewer of 3D geometry in Windows 95/98/NT. It supports many of the common 3D file formats to provide one quick and easy viewing solution.". Well, I saw it would support the VTK format, but was unable to test it.