CircuitLogix - CircuitLogix electronics lab simulation provides fast, powerful schematic design and simulation in one complete program.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
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.
Multisim - Multisim is industry standard SPICE simulation and circuit design software for analog, digital, and power electronics in education and research.