SoQtPlaneViewer(3) on Linux
The text cb31fef92c2e, as Debian 8 (Jessie) shipped it.
The SoQtPlaneViewer class is for examining 3D models by moving the camera in orthogonal planes. The SoQtPlaneViewer is a viewer that is useful for 'CAD-style' applications, where you want the end-user to examine your model with the viewpoint set from one of the three principal axes.