SimulIDE is a simple electronic circuit simulator. It allows you to interactively simulate analog and digital circuits, as well as work with microcontrollers. It includes a variety of ready-made components and a built-in code editor.

It supports PIC, AVR, Arduino, and other microcontrollers and microprocessors.

Features:

Qucs-S (Quite Universal Circuit Simulator with SPICE) — is an electronic circuit simulator that provides engineers, students, and radio amateurs with a powerful tool for designing and analyzing electronic devices.
You can create circuits graphically and run simulations of large or small signals, noise, and observe the circuit's behavior.
You can view the simulation results on the presentation page.
In summary, Qucs-S is a powerful and flexible program for simulating electronic circuits.

Key features and benefits: