Open Web Globe

http://www.openwebglobe.org/

 

http://www.openwebglobe.org/gallery/video/ 

http://www.openwebglobe.org/gallery/screenshots/

 

http://vterrain.org/Packages/NonCom/

 

OpenWebGlobe SDK

• Can do imagery, elevation as tiled TINs, and even streamable colorized point clouds(!)
• The demo includes a chunk of Switzerland.

Stavros's Project Windstorm demo

• An impressive WebGL implementation of a smooth, tiling, well instrumented terrain engine with a nice GUI.  It uses geomipmaps with strips or skirts, detail textures, time of day lighting with cast shadows, and more.  The issue of how to do smooth paging in JS (no multithreading) is addressed.
  

three.js is a WebGL library that enables many projects

• including some like Trigger Rally that feature terrain