Files
libremetaverse/applications/sceneviewer

sceneviewer uses XNA, a Microsoft DirectX technology for the .NET framework. 
Currently the XNA framework requires Visual C# Express (it can be installed 
alongside VS2005 or any other IDE), and the XNA Game Studio Express Beta 2.

C# Express: http://msdn.microsoft.com/vstudio/express/visualcsharp/
XNA:        http://msdn.microsoft.com/directx/XNA/default.aspx
XGE:        http://msdn.microsoft.com/directx/xna/gse/