For anyone unacquainted with it, GrabCAD Workbench is a cloud based collaboration tool that specializes in 3D model sharing. Think Google Drive or Dropbox on steroids with crazy CAD powers. It keeps track of multiple revisions and works with all the major CAD software packages. It has 3D model viewing functionality built right into their browser interface and even has tablet apps. Their promotional video can do it more justice than I can, but long story short, GrabCAD Workbench has the potential to be a really cool product.
Yesterday, GrabCAD drastically changed their pricing strategy. What was a $70/user/month and $107/user/month for unlimited storage subscription has just become free. Here is the direct link for anyone who wants to check it out.