Zephyr is described as 'Small real-time operating system for connected, resource-constrained devices supporting multiple architectures and released under the Apache License 2.0 backed by the Linux Foundation' and is an app. There are four alternatives to Zephyr for Windows, BSD, Mac and Linux. The best Zephyr alternative is FreeRTOS, which is both free and Open Source. Other great apps like Zephyr are embOs, NuttX and RIOT.
FreeRTOS is a real-time operating system kernel for embedded devices that has been ported to 35 microcontrollers. It is distributed under the MIT License.
FreeRTOS is the most popular Windows, Mac & Linux alternative to Zephyr.
FreeRTOS is the most popular Open Source & free alternative to Zephyr.
embedded Operating System (embOS), is a Real-time operating system, developed by the Company SEGGER Microcontroller. It's designed to be used as a foundation for the development of embedded real-time applications for a wide range of µc.
NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 32-bit microcontroller environments, the primary governing standards in NuttX are Posix and ANSI standards.
RIOT is a small operating system for networked, memory-constrained systems with a focus on low-power wireless Internet of things (IoT) devices. - Wikipedia
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