ProSteel V8i for AutoCAD 2004-2009 download

It is a 3D modeling environment for structural steel and metal work
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Alternative software

ArcGIS Image Server AutoCad Client
ArcGIS Image Server AutoCad
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You can view an image service using various client applications.

P-CAD 2004 Libraries
P-CAD 2004 Libraries
Free
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Part of the P-CAD 2004 Service Pack 4.

ArcGIS for AutoCAD 300
ArcGIS for AutoCAD 300
Free
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It is a plug-in that provides interoperability between AutoCAD and ArcGIS.

AutoCAD Plant 3D 2010 Object Enablers
AutoCAD Plant 3D 2010 Object
Free
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It can can be used to access, display, and manipulate object data.

Electrical engineering Library for progeCAD PRO ENG
Electrical engineering Library
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This is a 2D/3D CAD application that natively works with AutoCADĀ® DWG files.