KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
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.
Osmond PCB - Design printed circuit boards software
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
YunoHost - YunoHost is a Debian GNU/Linux based distribution packaged with free software that automates the...
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.