Logisim - Logisim is an educational tool for designing and simulating digital logic circuits.
Synopsys VCS - HDL Simulator of System Verilog, Verilog, and VHDL for ASIC design and verification.
BOOLR - Open-source digital logic simulator
ModelSim - ModelSim-Altera Software
Digital Logic Design - Digital Logic Design is a Software tool for designing and simulating digital circuits.
Cadence Incisive - System Verilog, Verilog, VHDL, SystemC HDL Simulator for ASIC Design and Verification