There are a variety of electronics simulation tools available, each with their own strengths and applications. Here are some of the most popular ones:

LTspice: 

A free circuit simulation tool for analog circuits, LTspice offers a wide range of models for diodes, transistors, and other electronic components.

Proteus: 

A comprehensive electronics simulation tool that offers simulation of microcontrollers, circuits, and PCB design. Proteus is widely used for simulation of embedded systems.

Multisim: 

A popular circuit simulation tool that offers a user-friendly interface and a range of simulation options, including virtual instruments and measurements.

TINA-TI: 

A free circuit simulation tool for analog circuits from Texas Instruments. It offers a wide range of models for various electronic components, and is commonly used for simulation of op-amps and filters.

MATLAB/Simulink: 

Widely used for control system design and simulation, MATLAB/Simulink is also used for electronics simulation. It offers a range of models for electronic components, and allows for simulation of digital circuits.

PSpice: 

A comprehensive circuit simulation tool that offers simulation of analog and digital circuits, and can be used for simulation of power electronics and power systems.

CircuitMaker: 

A free, open-source circuit simulation tool that offers simulation of analog and digital circuits, and allows for schematic capture and PCB design.

These are just a few examples of the many electronics simulation tools available. Each tool has its own unique features and applications, so it's important to choose the one that best meets your needs.