ArcScene is a 3D visualization application that allows you to view your GIS data in three dimensions.
ArcScene allows you to overlay many layers of data in a 3D environment. Features are placed in 3D by reading height information from feature geometry, feature attributes, layer properties, or a defined 3D surface, and every layer in the 3D view can be handled differently. Data with different spatial references will be projected to a common projection, or data can be displayed using relative coordinates only. ArcScene is also fully integrated with the geoprocessing environment, providing access to many analytical tools and functions.
Click here to access My Scene (an online version of ArcScene).