https://github.com/au-ts/lionsos
> LionsOS is aimed at embedded, IoT and cyberphysical systems and is designed to be formally verifiable, adaptable to a wide class of use cases in the target domain, while at the same time setting the benchmark for performance of microkernel-based operating systems. We aim to achieve all three goals by a highly modular yet ruthlessly performance-oriented design and strict adherence to the time-honoured KISS principle.