Nemesis

Nemesis
Supports time-sensitive programs needing consistent Quality of Service (QoS), e.g., multimedia; fine-grained guaranteed levels of all system resources: CPU, memory, bandwidth of network, disk. Archive site, Systems Research Group: Networks and Operating Systems; University of Cambridge.
http://www.cl.cam.ac.uk/research/srg/netos/old-projects/nemesis/

Nemesis (computing)
Growing article, with links to many related topics. Wikipedia.
http://en.wikipedia.org/wiki/Nemesis_(computing)

Nemesis, SourceForge
An operating system with principles. All-new lightweight kernel OS; focus: support time-sensitive uses needing consistent Quality of Service (QoS), such as those using multimedia. Fine-grained guaranteed levels of all system resources including CPU, memory, disk and network bandwidth. Downloads, manuals, fine OS map.
http://nemesis.sourceforge.net/