Synopsys VCS - HDL Simulator of System Verilog, Verilog, and VHDL for ASIC design and verification.

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

Riviera-PRO - System Verilog, Verilog. VHDL, SystemC, HDL simulator targeting ASIC and large FPGA designs.

Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.

Cadence Incisive - System Verilog, Verilog, VHDL, SystemC HDL Simulator for ASIC Design and Verification

Oregano - oregano - An electrical engineering tool for GNOME