Ostro

"An open source reference Linux*-based operating system built using Yocto Project tools. Ostro OS is tailored for IoT smart devices so you won't need to force-fit a general Linux OS to suit your IoT device or write your own OS. The Ostro OS is simple for existing Linux users to adopt and it conveniently provides an application framework that supports multiple developer languages. It is out-of-the-box ready to install and has powerful features that easily support IoT device development.

Ostro Project provides simplified access to complicated IoT required constructs including pre-configured and validated sensor support, various level of security mechanisms, and communications and interconnectivity protocols such as Open Connectivity Foundation (OCF) via built-in IoTivity support. Ostro OS is both expandable and customizable. The base OS image can be used as-is or configured without recompiling for faster development. Two reference images are available: the base Ostro OS (for headless devices) and Ostro OS XT (eXTended for devices with graphics and media support).

Ostro™ OS is a Linux* distribution optimized for the development of connected and embedded devices. In fact, Ostro Project is designed specifically to support IoT device development. It integrates connectivity and networking, device-to-device interconnectivity standards, pre-configured sensors, and over-the-air update capabilities.

The Ostro Project is all about making IoT device development easy and fast on multiple architectures. Developers have their choice of application languages as Ostro Project supports Native C/C++ and Node.js. Pre-built binary distributions are available that you can configure to get devices up
and running immediately on supported platforms. Ostro Project includes powerful capabilities for developers to tailor the OS to their liking."

https://ostroproject.org/

https://www.iotivity.org/