RealityMAX
Circuit Tree
CircuitLab
Logisim
Synopsys VCS
Riviera-PRO
BOOLR
Atanua
Cadence Incisive
LTspice
KiCad
Proteus PCB design
QUCS
Fritzing
Pspice
Circuit Simulator
EasyEDA
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.
Circuit Tree LTspiceCircuitLab - Sketch, simulate, and share your circuits, entirely in your browser -- no install required.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Logisim - Logisim is an educational tool for designing and simulating digital logic circuits.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
Synopsys VCS - HDL Simulator of System Verilog, Verilog, and VHDL for ASIC design and verification.
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.