LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
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...
FreeCAD - An open-source parametric 3D modeler
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.