Most Probably the companies which use CAD software are defined in different categories such as in two parts 3D Modeling Software, CAD. And also For those who have a demand in Civil Engineering such as for Mechanical , Electrical design and others. Civil Engineers who wants a Design in such Big Projects then CAD which minimize works for the Contractors or an Engineers. And also for more you can visit here also.

What are the various techniques that are available to access and use the CAD software?
You can find free CAD software online at: www.freecad.com/, download.cnet.com/mac/cad-software/, and also online at www.cadazz.com/free-cad-software.htm.
No, it is presentation software. It has limited graphics capabilities, but nothing like what CAD software can do and it does not have the specialised facilities that CAD software has to do design work.
use a CAD software like EAGLE
Computer Aided Design-CAD is defined the use of information technology (IT) in the. Design process. A CAD system consists of IT hardware (H/W), specialised software.
3D animation software
Catia, Unigraphics, Pro-e, Visi CAD, Inventor....... SolidWorks 3D CAD Software.
Auto-CAD software, like Ship Constructor, is used in ship building.
Amazon.com sells boxed versions of CAD software. You can also order digital download CAD packages from usa.autodesk.com.
CAD means computer-aided design. 3D CAD is often used by architectural and construction companies. CAD is a software used by building companies and professionals to render their drawings and sketches.
auto cad
Most Probably the companies which use CAD software are defined in different categories such as in two parts 3D Modeling Software, CAD. And also For those who have a demand in Civil Engineering such as for Mechanical , Electrical design and others. Civil Engineers who wants a Design in such Big Projects then CAD which minimize works for the Contractors or an Engineers. And also for more you can visit here also.