Open Source Real-Time Operating Systems

Pareto Amp is open-source firmware for networked I2S audio amplifier systems based on ESP32 and ESP32-S3 microcontrollers. Built with ESP-IDF and FreeRTOS alongside LwIP and SPIFFS, it features Bluetooth A2DP sinking, USB audio streaming, Snapclient playback, hardware and software parametric equalization, and an integrated web control interface. It targets custom audio hardware including the Amped and Louder board series.

jRadio is an all-in-one open-source audio player firmware for the ESP32-S3 microcontroller, supporting internet radio, local audio from USB and SD storage, DLNA media servers, Yandex Music, and FM radio. Built on ESP-IDF and FreeRTOS, it utilizes LVGL for graphical displays and lwIP for networking. The system features a responsive web interface, infrared remote learning, alarms, and browser-based OTA configuration.

An open-source audio receiver firmware for ESP32-S3 microcontrollers that decodes and plays wireless 5.1 and 7.1 multichannel surround streams from Apple TV over AirPlay 2. Running on FreeRTOS and ESP-IDF with LwIP networking, each board synchronizes via Precision Time Protocol (PTP) and efficiently isolates and outputs a single target channel to an I2S DAC or amplifier.

An ESP32-S3 multi-protocol wireless hardware debugger that bridges physical debugging interfaces with network services and AI tooling. Built on ESP-IDF with FreeRTOS and lwIP, it supports UART, SPI, I2C, PWM measurement, and CMSIS-DAP SWD debugging alongside an onboard ST7735 LCD and Model Context Protocol (MCP) server integration.

HellzGate is a multi-node wireless research platform built for the Espressif ESP32-C5 microcontroller. Running on ESP-IDF and FreeRTOS, it coordinates a master controller and multiple scanner nodes over ESP-NOW or I²C to perform passive dual-band Wi-Fi and BLE observation logging with GNSS time and location stamping.

Vibe Watch is a wearable, tactile control surface for parallel AI-assisted coding built on the M5Stack StopWatch. Powered by an ESP32-S3, it leverages a 466 × 466 round touchscreen, tactile buttons, sound, and haptics alongside Bluetooth Low Energy to monitor up to six AI agent sessions and provide instant physical approval and voice controls.

HackMan3D Control Deck is a family of programmable desktop macro controllers pairing dedicated embedded hardware with a cross-platform PySide6 configuration application. The entry HCD-BASE model runs on an ATmega32U4 (Arduino Pro Micro) to monitor mechanical MX switches and drive status LEDs, while larger variants expand to encoder multiplexing and ESP32-S3 touchscreen control. Communication occurs over serial USB via a continuous heartbeat protocol for active profile execution and key mappings.

AVAJA is a compact USB debug probe designed for RISC-V softcores and FPGA development boards. Powered by the WCH CH32V307 RISC-V microcontroller, it integrates a CMSIS-DAP v2 JTAG interface, a target UART bridge, and target-powered level translation onto a single PMOD-sized board.