SketchUp Make - SketchUp Make is a best in the class CAD software capable of performing 2D and 3D rendering and designing, however, best for the 2D projects.
FreeCAD - An open-source parametric 3D modeler
OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Solid Edge - Solid Edge is an industry-leading mechanical design system with exceptional tools for creating and...
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite