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FreeCAD - An open-source parametric 3D modeler
Drawing Desk - Drawing Desk Draw Paint Color, Doodle and Sketch Pad created and published 4Axis Technologies for Android and iOS devices.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
DWG FastView - DWG FastView for Windows is a lightweight dwg/dxf drawing viewer and editor produced by Gstarsoft, no need of dwg format conversion, vector graph magnified without distortion and full compatible with AutoCAD DWG/DXF.
SketchUp - 3D for Everyone
Qlone - 3D scan any object with your iPhone or iPad