iCircuit - Its advanced simulation engine can handle both analog and digital circuits and features realtime...
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Altium Designer - PCB Design Software
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
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.