Create 3D landscapes using real-world data from the United States Geological Survey and extra-terrestrial data from NASA. [Win9x+]

An experimental OpenGL interactive terrain viewer with surface textures, clouds and reflective water capabilities. (free, with code) [Win32]

Free program that edits, generates, and manipulates terrain height maps. These can be used in terrain renders, which are used in games, applications, and demos. Web base manual available. [Windows and Linux]

Specializes in the import of GIS data sets and creation of a GIS viewer, which allows the user to "fly" over a 3-D image of their data sets.

Free authoring tool for virtual environment training system. A low cost PC-based system which incorporates trainee performance measurement capability. [Win9x/NT/2k]

A free win32 3D viewer which demonstrates Dynamic Level of Detail (DLOD), based on OpenGL and GLUT, only reads USGS DEMs. Appears to be in active development.

Visualization tool that permits the user to view RealSite (tm) models within a virtual environment. [IRIX, Win32]

A heightfield modelling tool designed to mimic Leveller for Windows. It features an OpenGL preview and many brush-like tools. (free, with code) [Linux]

Makers of G-Vista, G-Scene, G-Render Library, software components for CD-ROM/DVD-ROM/Web-productions to interactively fly over huge contiguous terrains. Target market: high end professional.

Software for visualisation of non-tangible data related to the urban environment. It may be used to construct 3D thematic 'maps' such as land use. A component of the Virtual Field Course from the U. of Leicester. [Win9x/NT/2k]