Thinking AutoCAD or dwg and dxf files 2D and 3D, what online services can you think of that are not available online or are too difficult for you to use on existing services that can improve a lot.
It can be in the Mechanical field, Electrical field or just plain anything you can think of that can make your life a hell of a lot easier in your work or personal life.
Below are some suggestions. Please vote for them or simply write your own idea / suggestion in the comments below.
(Also if applicable, suggest a price you would pay for such a service. (this will help keep everything online but in some case can be free)