Yep, finally, you can mark-up, measure and merge in Design Web Format (DWF) files for the very nice price of a free download.
FREE FREE FREE... Autodesk? - Between The Lines ~ AutoCAD Blog
Yes, Autodesk Design Review is now free to download.Now you can convert, markup, group, and more all for to your hearts content all for FREE...Downloads
Design Review – FREE*
Autodesk DWF Viewer – FREE*
Autodesk DWF Writer – FREE*Autodesk Design Review is free - Beyond the Paper DWF Blog
Autodesk is offering Autodesk® Design Review software free-of-charge…My [Scott’s] summary of features from the Autodesk Design Review 2007 launch…