SketchUp - 3D for Everyone
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Sweet Home 3D - Sweet Home 3D is a free interior design application that helps to draw the plan of house, arrange furniture on it and visit the results in 3D.
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.