WW2D now runs on Linux using Mono:
World Wind on Linux.
[WW2D] [..] is cross-platform, free and open-source version of NASA World Wind software, see http://worldwind.arc.nasa.gov for details. WW2D allows you to explore Earth using satellite imagery, topographic maps and image from other data sources also providing large placenames and boundaries database and allowing you to install community-made add-ons for even more information about our planet.
In basic configuration WW2D uses images from Blue Marble (1 km/pixel), LandSat7 (15 m/pixel), USGS Topo Maps, USGS Digital Ortho imagery, USGS Urban Area imagery.
WW2D is designed to dynamically download needed data from internet, however you can download data you want for faster access and offline usage.
This is not the original NASA software, but a new implementation sharing some of the data. To render they use Tao.OpenGL and a little bit of native code.
The new version is available here to run make sure you have libgdiplus+ installed and then do this:
$ cd demo-linux $ mono WW2D.Frontend.exe