BOINC - BOINC is an open-source software platform for computing using volunteered resources
Charity Engine - Charity Engine takes enormous, expensive computing jobs and chops them into 1000s of small pieces...
FlashMob ISO - FlashMob ISO (OS) was custom developed by the University of San Fransisco for their supercomputer.
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
DIET by Avalon - DIET is a software for grid-computing.
PlumpOS - PlumpOS is a mini linux distribution aimed at an easy way to add nodes to an openMosix cluster...