TerraVision 6.0 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Display.exe or TclTV.exe are the default file names to indicate this program's installer. The most popular version of the tool 6.0. This free program was originally developed by SRI International. TerraVision is categorized as Photo & Graphics Tools.
From the developer:
TerraVisionTM is an Open Source distributed, interactive terrain visualization system developed by SRI International. It allows users to navigate, in real time, through a 3-D graphical representation of a real landscape created from elevation data and aerial images of that landscape.
You may want to check out more software, such as Montagne, Wire Pilot Plugin or ImageVisu, which might be similar to TerraVision.