FreeCAD - An open-source parametric 3D modeler
Morpholio Trace - Morpholio Trace is widely called to be the dream software of the designers and architect.
SolidWorks - Dassault Systèmes SolidWorks Corp. develops and markets 3D CAD design software, analysis software, and product data management software. SolidWorks is the leading supplier of 3D CAD product design engineering software.
Qlone - 3D scan any object with your iPhone or iPad
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Drawing Desk - Drawing Desk Draw Paint Color, Doodle and Sketch Pad created and published 4Axis Technologies for Android and iOS devices.