SlashGeo pointed me to LandSerf, an interesting bit of free GIS software (not open source) for viewing and analysis of DEMs, TINs, and other files in 3D. It uses OpenGL for the 3D graphics, and has a variety of features for lighting/shading, blending of multiple images, and supports a bunch of import and export file formats. It runs on PCs, Macs, and Linux/Unix as long as you have the Java Runtime Environment. I didn’t explore too far, but it appears that it also has some scripting/API support. (Image by LandSerf)
The newest version of desktop GIS mapping software, SuperGIS Desktop 3.1a Beta 3 developed by SuperGeo, is available now.
Featuring plentiful GIS tools and user-friendly manipulation environment, SuperGIS Desktop 3.1a allows GIS experts to display, edit, manage, query, and analyze diverse spatial data effectively.
The newest SuperGIS Desktop 3.1a enhances the manipulation of attribute table and map query, which enables you to easily navigate maps and export them to diverse formats. The whole new Graph add-on provided by SuperGIS Desktop 3.1a improves the interaction between the graph and the map selection. [Editor] Click through for the rest of the press release. [/Editor]