The TerraServer project split into two branches, read both Wikipedia pages: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;TerraServer" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;TerraServer</a><p>Also NASA World Wind got popular, just before Google Earth, and was initially more advanced: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;NASA_World_Wind" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;NASA_World_Wind</a>