DraftSight

DraftSight screenshots

Create, edit, view, and mark up any kind of 2D drawing and DWG file

Alternative downloads

Bentley OpenPlant Modeler V8i (SELECTseries 5)
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OpenPlant Modeler V8i is a powerful 3D CAD plant modeling program.
Autodesk Alias Design 2014
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You can develop 3D product designs from concept to final surfaces.
OnlineMaps for DraftSight
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Browse and insert maps into drawings.