Autodesk released A360 viewer a browser-based viewer that allows you to view 2D and 3D models for over 50 CAD formats without any registration or plugin, just drag the files within the web. Important thing is to have Chrome, Safari, Firefox or IE 11 to allow visualization

For more info: http://forums.autodesk.com/t5/a360-blog/in-the-lab-what-s-coming-up-in-the-new-a360-viewer/ba-p/5565476

and to strat see: https://360.autodesk.com/viewer