FreeRTOS
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FreeRTOS is a real-time operating system for embedded devices, being ported to several microcontrollers. It is distributed under a modified version of the GPL.
FreeRTOS can be downloaded for free, without having to fill out a form or provide any information. The download contains pre-prepared configurations and demonstrations for 8, 16 and 32bit processors, allowing rapid application design.
The FreeRTOS.org site also contains RTOS tutorials, details of the RTOS design and performance comparison results for various microcontrollers.
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