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...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…