Downloading dem3d 2.0 from our website was free. The program's installer is commonly called dem3d.exe. This free software is a product of oregonexplorer. The most popular version of the tool 2.0. The software lies within Photo & Graphics Tools, more precisely Viewers & Editors.
From the developer:
The Dem3d allows us to view and move DEM files (.dem format) through a 3-dimensional perspective. This free downloadable software was provided by the footer image. USGS Mid-Continent Mapping Center (MCMC), but MCMC no longer provides support for this viewer.
The dem3d viewer runs on Windows platform.
You may want to check out more software, such as Wire Pilot Plugin, ZoomMagic or PP3 Private Album, which might be related to dem3d.