Circuit Tree
CircuitLab
Logisim
Synopsys VCS
Riviera-PRO
LTspice
BOOLR
Atanua
Proteus PCB design
KiCad
Fritzing
LTspice
Autodesk EAGLE
EasyEDA
LibrePCB
Altium Designer
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 Proteus PCB designCircuitLab - 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.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Synopsys VCS - HDL Simulator of System Verilog, Verilog, and VHDL for ASIC design and verification.
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.