NuttX is described as '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' and is an app. There are four alternatives to NuttX for Windows, Linux, Mac and BSD. The best NuttX alternative is FreeRTOS, which is both free and Open Source. Other great apps like NuttX are Zephyr, RIOT and embOs.
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 NuttX.
FreeRTOS is the most popular Open Source & free alternative to NuttX.
Zephyr is a 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.
RIOT is a small operating system for networked, memory-constrained systems with a focus on low-power wireless Internet of things (IoT) devices. - Wikipedia
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.
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