SimpleRTOS

SimpleRTOS is an RTOS based on concepts from FreeRTOS but with a much smaller memory footprint.
It doesn't rely on dynamic memory allocation, although it can use it if necessary.
Currently there are ports for PIC18F, dsPIC/PIC24, PIC32 (MX and MZ) and Atmel SAM3 (ARM Cortex-M3) devices.
The PIC32 and SAM3 ports are already in use for production projects. dsPIC/PIC24 port seems to be OK. although no real project was tested with it and PIC18 port is still a little buggy.
There are plans for writing ports for ARM Cortex-M0 and Cortex-M4.

Features

Very small memory footprint.
Has the FlexiQueue, a queue that can hold varying size objects.
Simple structure. Doesn't use a lot of macros that embed a lot of the kernel's code into the user's code.
Can be used as a library,
Doesn't require dynamic memory allocation.
Has real mutexes, that only the task that took the mutex can give it back.

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