Riviera-PRO VS Pspice

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.

ModelSim - ModelSim-Altera Software

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

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