AutoDesk has released an app for Chrome browser that is a stripped down AutoCAD. All files are stored in the cloud and can be shared. From the looks of it, its not 3D. You could do simple groundplans and such with it. Could be pretty cool.
https://chrome.google.com/webstore/detail/dcjeclnkejmbepoibfnamioojinoopln
https://chrome.google.com/webstore/detail/dcjeclnkejmbepoibfnamioojinoopln