FreeCAD - An open-source parametric 3D modeler
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
VARKON - Varkon is a very powerful parametric 2D/3D CAD, modeling and application development tool for...
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
ArCADia-Architecture - ArCADia-Architecture is a revolutionary component for the instant creation of architectural documentation and object drawing.
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.