FidoCADJ - FidoCadJ is a free user-friendly vector graphic editor for Mac OS X, Linux, Windows and Android.
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.
JumboCAD EDA - JumboCAD EDA contains 3 packages, Schematic Capture, PCB designer and Library Editor.
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
XCircuit - XCircuit: Home Page
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.