The Zephyr™ Project, is a Linux Foundation hosted Collaboration Project, an open source collaborative effort uniting leaders from across the industry to build a best-in-breed small, scalable, real-time operating system (RTOS) optimized for resource constrained devices, across multiple architectures.

OpenThread is a Thread Certified Component an open-source implementation of the Thread networking protocol. Nest has released OpenThread to make the technology used in Nest products more broadly available to developers to accelerate the development of products for the connected home.

Developed in partnership with the world's leading chip companies over a 12 year period, FreeRTOS is the market leading real time operating system (or RTOS), and the de-facto standard solution for microcontrollers and small microprocessors. Support for FreeRTOS on ARC Processors is provided under the embARC OSP project.

NuttX is a small footprint real-time operating system that implements POSIX and ANSI standards supplemented by APIs adapted from other common RTOSes. NuttX is sponsored by the Apache Software Foundation.

TencentOS tiny is a real-time operating system for the Internet of Things. It features low power consumption, low resource consumption, modularity, security and reliability, and can effectively improve the development efficiency of IoT terminal products. The TencentOS tiny project is sponsored by Tencent.

Huawei LiteOS is an IoT-oriented software platform that integrates an IoT operating system and middleware. It is lightweight, with a kernel as small as 10 KB, and energy efficient.

Contiki is an open source operating system for the Internet of Things. Contiki connects tiny low-cost, low-power microcontrollers to the Internet. Support for Contiki OS on ARC Processors is provided under the embARC OSP project.

RIOT is a free, open source operating system developed by a grassroots community gathering companies, academia, and hobbyists, distributed all around the world. RIOT implements all relevant open standards supporting an Internet of Things that is connected, secure, durable, and privacy-friendly. A port to the ARC EM Processor has been contributed by the community.

TOPPERS（Toyohashi OPen Platform for Embedded Real-time Systems）Project, based on ITRON, is aimed at base software for use in embedded systems. The TOPPERS/ASP kernel is the foundation for the new generation of TOPPERS real-time kernels that follow the TOPPERS new generation kernel specification. ASP (Advanced Standard Profile) has been developed by extending and improving TOPPERS/JSP, a real-time kernel based on the standard profile of μITRON4.0. Support for the ARC architecture is available below.