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