μT-Kernel 3.0 is a Real-time OS for Small-scale Embedded Systems and IoT Edge nodes. It is compliant with IEEE Standard 2050-2018 and has high compatibility with μT-Kernel 2.0. Its source code has been reviewed and rewritten so that porting to latest microprocessors has become easier. It is not tied to particular development environment, and is usable with many such environments. μT-Kernel3.0 is d