3D Slicer

3D Slicer: A great tool for medical image processing and 3D visualization of image data

3D Slicer is a specialized medical image processing and 3D visualization of image data, and it's an open-source CAD application that can be run on Windows, Linux, and Mac OS X platforms. It also comes with support for DICOM image reading capabilities, automatic image segmentation, analysis and visualization of diffusion tension image data, etc.

The tool comes with a pretty clean Interface and integrates support for a large range of modules that can be activated from a drop-down list, while also integrates a built-in 3D viewer along with three default slice viewers where Axial, Sagittal, Coronal, or Oblique 2D slice of volume images can be rendered.

3D Slicer allows you to import MRML (Medical Reality Markup Language) scene files from XML-based text files, to help you load and visualize referenced data.

A wide range of view modes to work with, like four-up, 3D tabbed, dual 3D or conventional widescreen layout, and even control the 3D workspace using different parameters. (e.g. zoom in or out, enable orthographic or perspective projection, etc.)

In conclusion, 3D Slicer is a very powerful tool that supports a wide range of features that are specialized in medical image processing, and it's suitable for advanced users.