LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
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.
XCircuit - XCircuit: Home Page
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Pspice - OrCAD PSpice technology provides the best, high-performance circuit simulation to analyze and refine your circuits, components, and parameters before committing to layout and fabrication