3 ms·
http://grabcad.com/ http://grabcad.com/
http://grabcad.com/ http://grabcad.com/
http://p3d.in/ http://p3d.in/ is another one.
Am I missing something? Grabcad while great does not have webgl based viewer like sketchfab. Also, it seems to be sketchfab supports wide number of formats.