Using the 3DxWareSDK provided by 3Dconnexion, connect to a SpaceMouse if it is available, and use it to manipulate the camera in the active renderview. The 3Dconnexion Settings app provided with the driver can be used to change the style of interaction from object-centered to camera-centered (flying).
Only works on Windows currently and provides an empty placeholder for linux/mac, Mac support is planned as a follow-up. 3Dconnexion does not provide an equivalent SDK for linux.