Google SketchUp - original solid geometry model
3D Coat - voxel smoothing
ZBrush - turntable animation
Ok, so I have to say this:
3D Coat and ZBrush are AMAZING programs but manage object/world rotation really bad.
ZBrush is OK if you release the button every time you want to change the rotation axis.
But in 3D Coat I can hardly sculpt because I always have to worry about the rotation. Sometimes you really have to twist your brain to get your model in a certain position. Of course you can use Transform but when you rotate voxels it's really bad - because just like for an image, you work with a discrete grid.
Maybe I'm doing something wrong. Anyways...
In my own programs it's a lot better... too bad I don't have time to look into CUDA and start my own voxel sculpting application.
In more technical terms the rotation in the major 3d applications (Maya, ZBrush, 3D Coat, Max(?)) is done with two angles - one in the horizontal plane (0 -> 360 degrees) and the other is the inclination to the plane (-90 -> 90 degrees).
These might be ok for working on a flat plane and create buildings like SketchUp but they are somewhat impractical for sculpting, where you would rather turn the object as if it were in zero gravity.
If you know someone at these companies please tell them to do the rotations right