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

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.