How to blink LED connected to 8051 Microcontroller

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…

OPEN SOURCE RTOS / Embedded OS

Name RTOS	Description
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 Real Time 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.

PROPERITARY RTOS / Embedded OS

Name RTOS	Description
QNX	QNX is real time RTOS, which support ARM, MIPS, PowerPC, SH and X86 Processor family.
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 Real Time 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.