OpenModelica - OpenModelica – A Free Modelica Environment!
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.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
SimulationX - SimulationX is a system simulation solution provided by ESI ITI. The company has been operating for over 25 years. The SimulationX software was introduced in 2015. Read more about SimulationX.
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.