The best free alternative to Wokwi Arduino Simulator is Velxio, which is also Open Source. If that doesn't suit you, our users have ranked six alternatives to Wokwi Arduino Simulator and four of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Wokwi Arduino Simulator are Autodesk Tinkercad, avr8js and UnoArduSim.
Emulate Arduino, ESP32 & Raspberry Pi. in your browser. Write code, compile, and run on 19 real boards — Arduino Uno, ESP32, ESP32-C3, Raspberry Pi Pico, Raspberry Pi 3, and more. No hardware, no cloud, no limits.
Tinkercad is a super easy-to-use, browser based 3D design tool. With Tinkercad you can create 3D printable items: toys to play with, decoration to light up your home or jewelry to express yourself. You dream it, you can make it!
UnoArduSim provides a virtual target Uno board and allows the user to choose, and interface to, one or more of several types of virtual input/output devices.
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AVR8js is the JavaScript backbone of Wokwi. It by itself does not have an interface for editing code or for simulating drag-and-drop circuits.