So GrabCAD is not a CAD package in its own right?!

After signing up I thought I can start designing but realize that the cooperation is only about uploaded files nots and ???.
2 Answer

Also GrabCAD is expanding it's services: toolbox Toolbox will be an ever evolving web based CAD modeler.
I'm a big fan of collaboration too, and for me, it happens here everyday with some awesome results with clients and fellow GrabCAD'rs.
Some examples of good times on GrabCAD
Solidworks City
Fish Aquarium - 38 Models, 100+ renderings, one download!
mōna mission project - GrabCAD on the moon
Jurassic City - Before CAD walked the Earth
GrabCAD ~ POD Races
You're in the right spot!