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Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.

RT-Thread is an open source IoT Real-Time Operating System (RTOS). https://rt-thread.github.io/rt-thread/

Apache NuttX is a mature, real-time embedded operating system (RTOS)

Mirror only see https://gitlab.rtems.org/rtems/rtos/rtems

Apache NuttX Apps is a collection of tools, shells, network utilities, libraries, interpreters and can be used with the NuttX RTOS

Apache NuttX RTOS for PinePhone

QP/C++ Real-Time Event Framework/RTOS implements event-driven Active Object (Actor) model combined with Hierarchical State Machines. Specifically designed for embedded systems (e.g., ARM Cortex-M MCUs).

A wee async RTOS for Cortex-M

A platform for building interactive control and sensing devices using MIDI and OSC built with Zephyr RTOS.

object-oriented C++ RTOS for microcontrollers

The main OpenAMP library implementing RPMSG, Virtio, and Remoteproc for RTOS etc

TizenRT is a lightweight RTOS-based platform to support low-end IoT devices

NCS downstream of https://github.com/zephyrproject-rtos/zephyr

X-CUBE-AZRTOS-H7 (Azure RTOS Software Expansion for STM32Cube) provides a full integration of Microsoft Azure RTOS in the STM32Cube environment for the STM32H7 series of microcontrollers.

Apache NuttX is a mature, real-time embedded operating system (RTOS).

AkiraOS is a modular, security-focused embedded platform for resource-constrained devices. Built on Zephyr RTOS with WebAssembly (WASM) runtime support and container technology

CherryECAT is a tiny and beautiful, highly real-time and low-jitter EtherCAT master stack, especially designed for MCUs running with RTOS