3d Cad

what is the most commonly used 3d cad software in uk?

~ There are so many variables for 3d programs, they would all be used and have to be compatible with international standards, and computer OS , and for architectural, mechanical and other designs,

AutoCAD +
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2704278
SolidWorks
http://www.solidworks.com/
Pro/ENGINEER PTC
http://www.ptc.com/products/proengineer/
Ascon Kompas 3d
http://ascon.net/solutions/kompas_3d/
Inivis AC3D – 3D Design Software
http://www.inivis.com/
Piranesi 3D CAD Software
http://www.piranesi.co.uk/
Imsi TurboCAD Professional
http://imsidesign.com/IMSIDesign/tabid/214/Default.aspx
ArchiCAD: 3D Architectural CAD
http://www.graphisoft.com/products/archicad/

Leonardo ~CAD software
http://www.leonardo-cad.co.uk/
Initial Graphics Exchange Specification
http://www.wikipedia.org/wiki/IGES
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3D CAD: Alibre 11 Design Program Overview