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

ModelSim - ModelSim-Altera Software

Oregano - oregano - An electrical engineering tool for GNOME

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

Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.