TL;DR
Velxio is an open-source simulator designed for Arduino, Raspberry Pi, and ESP32 boards that runs directly in your web browser. This self-hosted platform allows users to drag-and-drop components, connect modules, and write and execute code in both Arduino and Python, all without needing the physical hardware. It draws inspiration from the Wokwi simulator and utilizes various emulators like the AVR8 CPU emulator and a QEMU fork for ESP32 Xtensa emulation.