The Autodesk Freewheel web can display DWF files published from Inventor, AutoCAD or other CAD software. You don’t need any viewer software, just your Internet browser.
This Freewheel service has now several new functions which go beyond just viewing. It starts with publishing. The ShareNow utility installs in Inventor or AutoCAD and adds the ShareNow button to the menu. This automates the DWF publishing process to a single click – your Inventor assembly or drawing is converted to DWF, the DWF file is uploaded to Freewheel and displayed in your Internet browser. But you can not only view it – now there are also markup functions, plus you can share your viewing and markup session with selected users on the Internet.
The labs.autodesk.com web has more information for you.