PartSim
Pspice
Solve Elec
Oregano
PCBWeb
BlackBoard Circuit Designer
Circuit Simulator
PCB Wizard
Circuit Tree
CircuitLab
Logisim
Synopsys VCS
Riviera-PRO
LTspice
BOOLR
Atanua
Circuit Tree is an automation engine that autonomously designs a circuit board design with given user inputs. Using Components define as proprietary models in its database it creates schematic, component placement and routing on the fly. This means that the automation engine auto selects various types of components for a circuit and knows where to place and route these components on board.
Circuit Tree design engine has been designed by engineers who have experience of more than 20 years designing all types of first time right designs.
PartSim Circuit TreePspice - 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
CircuitLab - Sketch, simulate, and share your circuits, entirely in your browser -- no install required.
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
Logisim - Logisim is an educational tool for designing and simulating digital logic circuits.
Oregano - oregano - An electrical engineering tool for GNOME
Synopsys VCS - HDL Simulator of System Verilog, Verilog, and VHDL for ASIC design and verification.