AutoCAD Electrical - AutoCAD Electrical design software is electrical engineering software for electrical CAD.
FreeCAD - An open-source parametric 3D modeler
QElectroTech - QElectroTech is a free software to create electric diagrams.
SketchUp - 3D for Everyone
SolidWorks Electrical - SOLIDWORKS® Electrical solutions simplify electrical product design with specific tools for engineers and intuitive interfaces for faster embedded electrical system design.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.