Open Source Real-Time Operating Systems

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.

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.

LVGL is a lightweight, open-source C graphics library designed to build professional user interfaces on any microcontroller or microprocessor. It features a hardware-independent architecture with low memory requirements, supporting advanced rendering features like anti-aliasing, animations, and complex layout engines.

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.

OpenBLT is a highly customizable, open-source bootloader designed for 8-bit, 16-bit, and 32-bit microcontrollers to facilitate firmware updates without specialized debugger hardware. It utilizes the standardized ASAM MCD-1 XCP protocol for communication and supports a wide range of interfaces including CAN, RS232, USB, and TCP/IP, complemented by cross-platform host utilities for Windows and Linux.

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.

modm is a modular C++23 library generator and hardware abstraction layer (HAL) designed for resource-constrained AVR and ARM Cortex-M microcontrollers. It utilizes the lbuild code generator to produce target-specific startup code, drivers, and communication protocols with a focus on zero memory allocation and high portability across thousands of devices.

Nuklear is a portable, single-header immediate-mode graphical user interface toolkit written in ANSI C (C89). It is designed as a dependency-free, embeddable UI library that provides a modular approach, outputting primitive draw commands or vertex buffers rather than abstracting platform-specific rendering backends.