Calculatoredge - calculators, engineering, mechanical, electrical, electronics, design, construction, manufacturing, consultant, layout, software, chemical, plastic, polymers

KiCad - A Cross Platform and Open Source Electronics Design Automation Suite

ECStudio - ECStudio app provides you with features that allow you to learn about the building of electric circuits and electronic circuit simulation so you can calculate various values of circuits right at your fingertips.

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.

Electronics Assistant - Electronics Assistant is a Windows program that performs electronics-related calculations.

Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...