McDwiff

McDwiff is an application that opens, views, converts, and prints DWF files.
McDwiff connects to Autodesk's online DWF translator, so accuracy is always 100%.

Of course this means your DWF is being uploaded to Autodesk servers, so don't use McDwiff unless you're OK with that. It's all private and stuff, but you never know.
It can open any DWF (2D or 3D) on your Mac just like any other file type. 3D files open, but 3D rotation is not possible yet.
McDwiff allows fast zooming and panning, supports multipage DWF files, lets you print DWFs, and can export DWF to TIF, GIF, JPG, PNG, BMP, or PDF.