It's on the very first webpage in the very first bullet under features:
"Free RTOS kernel - both preemptive and cooperative options."
:-)

Marcel

Chen Xiao Fan wrote:
> Xiaofan Chen wrote:
>> 
>> There are ports of uC/OS-II to PIC18F and dsPICs.
>> 
>> PIC18 port and the dsPIC ports of uC-OS II can be downloaded here:
>> http://www.ucos-ii.com/microchip/index.html
> 
> uC/OS-II is not free and it is actually not cheap.
> 
> The other commercial RTOS for PIC is Salvo but it seems not
> to be an preemptive RTOS.
> 
> There are also another free GPLed RTOS for PIC18 called PICOS18.
> It is here:
> http://www.picos18.com.
> 
> According to the author:
> "PICos18 is a preemptive real-time kernel for PIC18 based on the
> OSEK automotive standard.
> The application is running on Windows / MPLAB IDE.
> The code is open source and is distributed under GPL license."
> 
> According to Marcel van Lieshout, FreeRTOS is also preemptive.
> I do not see this mentioned in its website
> http://www.freertos.org.
> 
> 
> Regards,
> Xiaofan
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