MakerSCAD - Powerfull 3D design tool for 3D printing, virtual reality and game engine.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
SketchUp - 3D for Everyone
Microsoft 3D Builder - View, capture, personalize, and print 3D models.
FreeCAD - An open-source parametric 3D modeler
Draft it - Draft it is a CAD software package that allows to create, save, & print work with drawing tools that allows to create professional drawings for project.