Now you can view 2D and 3D DWF files on the web without installing anything at all. Since it is web based you can view DWF files from any operating system such as Apple OSX or even cell phones if you can see that small and have a web browser available.
Below is an example 3D DWF embedded in this blog post of a 3D DWF model from Autodesk Inventor.
Cheers,
Shaan