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SketchUp - 3D for Everyone
FreeCAD - An open-source parametric 3D modeler
ArchiCAD - ArchiCAD 16 enables BIM modeling with a new green approach to planning. Create anything you need with ArchiCAD's flexible new features for design.
AutoDesk InfraWorks 360 - InfraWorks 360 preliminary engineering and design software provides tools to work on infrastructure projects in a real-world context.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
SketchUp Pro - SketchUp Pro is a tool that enables designers to design, document and communicate their ideas in 3D.