RT-Thread (Real-Time Thread) is an open source embedded real-time operating system. It has a strong scalability: from a nano kernel running on a tiny MCU, for example ARM Cortex-M0, or Cortex-M¾/7, to a rich feature system running on MIPS32, ARM Cortex-A, even the emerging open source RISC-V architecture is supported. RT-Thread can run either on single-core systems or on symmetric multi-core processors(SMP) systems.
 
Kernel includes preemptive multi-task real-time scheduler, and infrastructure such as semaphore, mutex, mailbox, message queue, signal, event, memory management, timer management, interrupt management, etc. It also includes libcpu/BSP (file related to chip transplantation/board support package). It supports FAT, UFFS, NFSv3, ROMFS, RAMFS file system.

RT-Thread (Real-Time Thread) is an open source embedded real-time operating system. It has a strong scalability: from a nano kernel running on a tiny MCU, for example ARM Cortex-M0, or Cortex-M¾/7, to a rich feature system running on MIPS32, ARM Cortex-A, even the emerging open source RISC-V architecture is supported. RT-Thread can run either on single-core systems or on symmetric multi-core processors(SMP) systems.

RT-Thread - A Tiny and Elegant IoT Operating System

The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with security in mind. The Zephyr OS is based on a small-footprint kernel designed for use on resource-constrained systems: from simple embedded environmental sensors and LED wearables to sophisticated smart watches and IoT wireless gateways.
 
The Zephyr kernel supports multiple architectures, including ARM Cortex-M, Intel x86, ARC, Nios II, Tensilica Xtensa, and RISC-V, and a large number of supported boards. 
 
Its features include Extensive suite of Kernel services, Multiple Scheduling Algorithms, Highly configurable / Modular for flexibility, Cross Architecture, Memory Protection, Compile-time resource definition, Optimized Device Driver Model, Devicetree Support, Bluetooth Low Energy 5.0 support, Non-volatile storage (NVS), Powerful multi-backend logging Framework, Virtual File System Interface with LittleFS and FATFS Support.

The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with security in mind. The Zephyr OS is based on a small-footprint kernel designed for use on resource-constrained systems: from simple embedded environmental sensors and LED wearables to sophisticated smart watches and IoT wireless gateways.

Zephyr - Scalable real-time operating system (RTOS) supporting multiple hardware architectures

Contiki is an open source operating system for the Internet of Things. Contiki allows tiny, battery-operated low-power systems communicate with the Internet. The Internet of Things is catchphrase for a collection of technologies that make it possible to connect things like sensors and actuators to the Internet, thereby allowing the physical world to be accessed through software. It is best suited for handled PDA and mobile devices.

Contiki - Operating System for the Internet of Things 

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RT-Thread - A Tiny and Elegant IoT Operating System

Zephyr - Scalable real-time operating system (RTOS) supporting multiple hardware architectures

Contiki - Operating System for the Internet of Things

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RT-Thread - A Tiny and Elegant IoT Operating System

Zephyr - Scalable real-time operating system (RTOS) supporting multiple hardware architectures

Contiki - Operating System for the Internet of Things

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