FidoCADJ - FidoCadJ is a free user-friendly vector graphic editor for Mac OS X, Linux, Windows and Android.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
XCircuit - XCircuit: Home Page
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
JumboCAD EDA - JumboCAD EDA contains 3 packages, Schematic Capture, PCB designer and Library Editor.
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.