IronCAD
IronCAD is intuitive 3D CAD software that increases efficiency and can be used standalone or to complement an existing design environment.
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CAD Builder
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BRL-CAD
Open-source solid modeling
AutoCAD Web
OpenSCAD - Solid 3D CAD Modeller
IntelliCAD
CMS IntelliCAD is the intelligent, powerful and affordable full-featured 2D 3D DWG, DXF, DWF compatible CAD Software.
FreeCAD
FreeCAD, the open source 3D parametric modeler
AutoCAD | Autodesk