Charity Engine - Charity Engine takes enormous, expensive computing jobs and chops them into 1000s of small pieces...
PelicanHPC - PelicanHPC is an iso-hybrid (CD or USB) image that let's you set up a high performance...
BOINC - BOINC is an open-source software platform for computing using volunteered resources
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
JPPF - The open source grid computing solution.
Rocks - Rocksclusters website