Real Time Operating System (RTOS), are used in Embedded System. Now days there are so many vendors in the market which provide RTOS. Some of them are well established also. We try to compile a list of RTOS which are available in market as per our knowledge.

This list of RTOS is divided into two categories, Free or Open Source RTOS and Proprietary or Closed Source RTOS. Below is the complete list of RTOS…
RTOS LIST

List of rtos available in embedded system market
Last Edited: March-2016
RTOS, Free RTOS, Commercial RTOS, Proprietary RTOS, REAL TIME OPERATING SYSTEM - Keywords
NAME RTOS
DESRIPTION
Linux
This is the primary site for the Linux kernel source
eCos

eCos is provided as an open source runtime system supported by the GNU open source
development tools. Currently eCos supports ten different target architectures (ARM, Hitachi
H8300, Intel x86, MIPS, Matsushita AM3x, Motorola 68k, PowerPC, SuperH, SPARC and NEC
V8xx) including many of the popular variants of these architectures and evaluation boards.

uClinux

MMU Less version of Linux. Support ARM, Coldfire etc processor.

FreeRTOS

FreeRTOS.orgTM is a portable, open source, mini Real Time Kernel - a free to download and
royalty free RTOS that can be used in commercial applications
Support 17 architectures. ARM, AVR32, MSP430 etc.

RTAI

The RealTime Application Interface for Linux. It support following architecture ...
x86, PowerPC, ARM

coscox

An embedded real-time multi-task OS specially for ARM Cortex M4, M3 and M0 chipset.

Rocket OS
Wind River has provided its Rocket OS for devices for Free. Idea is OS should be made available
free for edge devices in IoT. Development environment for this OS also on cloud  Wind River
Helix App Cloud.
NAME RTOS DESRIPTION
QNX
QNX is real time RTOS, which support ARM, MIPS, PowerPC, SH and X86 Processor family.
VxWorks
Vxworks is also real time rtos, it support wide range of processor architectures like ARM, PowerPC, ColdFire, MIPS etc.
INTEGRITY
INTEGRITY is hard real time rtos. It support ARM, PowerPC, Coldfire,x86 etc processor architectures.
ThreadX ThreadX is Express Logic's advanced Real-Time Operating System (RTOS) designed specifically for deeply embedded applications. It support ARM, PowerPC,X86 etc.
MicroC/OS2
µC/OS-II, The Real-Time Kernel is a highly portable, ROMable, very scalable, preemptive real-time, multitasking kernel (RTOS) for microprocessors and microcontrollers. It support ARM, PowerPC,X86 etc.
embOS embOS is a priority-controlled multitasking system, designed to be used as an embedded operating system for the development of real time applications for a variety of microcontrollers.
SafeRTOS Real Time OS for mission critical applications based on the FreeRTOS scheduling algorithm, certified for IEC61508 SIL3, FDA 510K or DO-178B.
OPEN SOURCE RTOS / Embedded OS
PROPERITARY RTOS / Embedded OS
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