KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Altium Designer - PCB Design Software
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.
DipTrace - DipTrace - Professional Schematic Capture and PCB Design Software