Scout

Free for non-commercial use. Communication-oriented OS focused on network systems: network-attached devices, set-top boxes, and hand-held devices. Fast, customizable, based on new ways to structure and construct OSs: The Path: how data flows between end-points in a system; paths are primary objects to which resources are assigned. Also exploring new compiler technologies for system design and implementation, based on this insight: extensible OSs are worthless if no one can build or extend them.