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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
FreeCAD - An open-source parametric 3D modeler
Dock Designer - Customized to the specific building rules of dock building companies, Dock Designer enables visual design in 2D where you can see your dock design in 3D and have instant access to accurate estimates, parts lists, blueprints, and much more.
SketchUp - 3D for Everyone
FreeDraft - Full-featured 2D DWG, DXF compatible CAD Software
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.