Open Source Real-Time Operating Systems

This library provides a comprehensive Modbus implementation for STM32 microcontrollers, supporting TCP, RTU (USART), and USB-CDC interfaces. Built upon the STM32 Cube HAL and FreeRTOS, it enables multithread-safe concurrent execution of multiple Modbus Master and Slave instances across various hardware transport layers.

AWTK (Toolkit AnyWhere) is a high-performance, cross-platform GUI engine designed for a wide range of devices from low-end Cortex-M3 microcontrollers to high-end desktop and mobile systems. It features a decoupled MVVM architecture, hardware acceleration support, and a comprehensive suite of tools including a visual UI designer and multi-language bindings.

OpenThread is an open-source, OS-agnostic implementation of the Thread networking protocol designed for low-power wireless mesh networking in home and commercial automation. It features a highly portable architecture with a narrow platform abstraction layer, supporting System-on-Chip (SoC), Network Co-Processor (NCP), and Radio Co-Processor (RCP) designs while maintaining a small memory footprint.

TensorFlow is an end-to-end open-source platform for machine learning that provides a comprehensive ecosystem of tools, libraries, and community resources for both research and production. It features a flexible architecture allowing for seamless deployment across diverse hardware including CPUs, GPUs, and TPUs, while offering stable APIs in Python and C++ alongside a rich set of specialized extensions.

Libwebsockets (LWS) is a lightweight, high-performance C networking library providing client and server implementations for HTTP/1, HTTP/2, WebSockets, MQTT, and other protocols. It is designed for high scalability and flexibility, supporting both resource-constrained embedded RTOS environments like ESP32 and mass cloud serving through a non-blocking, event-driven architecture.

PlatformIO Core is a cross-platform, multi-architecture build system and unified package manager designed for embedded systems development. It provides a command-line interface that orchestrates toolchains, library dependencies, and build processes across hundreds of boards and dozens of frameworks, eliminating vendor lock-in.

SQLite is a C-language library that implements a small, fast, self-contained, high-reliability, and full-featured SQL database engine. It functions as a serverless, zero-configuration database that compiles SQL statements into bytecode for execution on a custom virtual machine, making it the most widely deployed database engine in the world.

esp-nimble-cpp is a high-performance, thread-safe C++ wrapper for the Apache NimBLE Bluetooth Low Energy stack, specifically optimized for the ESP32 series. It provides a resource-efficient alternative to the default Bluedroid-based library, significantly reducing RAM and Flash consumption while maintaining API compatibility with popular ESP32 BLE libraries.