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PRTOS is a simple, compact preemptive RTOS for embedded systems
PRTOS is an open-source preemptive real time operating system kernel for embedded applications. It presently supports the AVR and MSP430 architectures.
The advantages of PRTOS are:
It has the smallest footprint of any true preemptive system: 1.9kB for basic scheduling and task control, 5.1kB with all the features below (AVR '328 / gcc -Os);
Only 950 lines of code implement all of the RTOS features (SLOC-L);
The system is well documented with a comprehensive manual,...
ADQ is a set of linux kernel queuing disciplines based on buffer management and scheduling that supports delay guarantee w/o hard-limiting the traffic volumn the apps can generate. It also enforces link-sharing between different traffic classes.