OpenBuilds BLOX can be used with any existing ESP32-S3 supported firmware development toolchains and distributions you are already skilled in as well

Below just an handful of the popular ones:

ESP-IDF (Espressif IoT Development Framework)

• The official development framework for ESP32 and ESP32-S3.
• ESP-IDF GitHub
• Documentation

PlatformIO

• A cross-platform IDE with support for ESP32-S3.
• PlatformIO ESP32
• Documentation

Zephyr RTOS

• An open-source real-time operating system that supports ESP32.
• Zephyr RTOS Website
• ESP32-S3 Support

Tasmota

• A highly configurable firmware for IoT devices.
• Tasmota Website
• GitHub Repository

CircuitPython

• A beginner-friendly version of Python for microcontrollers.
• CircuitPython Website

Lua (NodeMCU)

• Firmware that enables Lua scripting on ESP32-S3.
• NodeMCU GitHub
• Documentation

MicroPython

• A lean implementation of Python 3, designed for microcontrollers.
• MicroPython Website
• Documentation

Blynk

• An IoT platform for developing applications with mobile app integration.
• Blynk Website
• ESP32 Integration

Espruino

• JavaScript interpreter for microcontrollers, including ESP32.
• Espruino Website
• ESP32 Support

NuttX

• A real-time operating system with a POSIX-compliant API, supporting ESP32.
• NuttX OS Website
• ESP32 Support