SPICE (Simulation Program with Integrated Circuit Emphasis) is the industry standard for analog circuit simulation. Most modern simulators are derivatives of this open-source engine.
Analog design, power electronics, and academic research. Examples: LTspice, PSpice, NGSPICE. 2.2 Digital and Logic Simulators simuliatory skhem skachat
An excellent, open-source tool for designing and simulating digital logic circuits. It is heavily used in computer science education. and academic research. Examples: LTspice