Charity Engine - Charity Engine takes enormous, expensive computing jobs and chops them into 1000s of small pieces...
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
BOINC - BOINC is an open-source software platform for computing using volunteered resources
DIET by Avalon - DIET is a software for grid-computing.
GridRepublic - Use GridRepublic, or Grid Republic, to join and manage participation in boinc volunteer distributed grid utility computing projects. Help us to create the world's largest top supercomputer. GridRepublic is a BOINC account manager.
Quantum Moves - Quantum Moves, part of the scienceathome.