OpenMOSIX Cluster

http://openmosix.sourceforge.net/

What is openMosix?
openMosix is a Linux kernel extension for single-system image clustering.  This kernel extension turns a network of ordinary computers into a supercomputer for Linux applications.

Once you have installed openMosix, the nodes in the cluster start talking to one another and the cluster adapts itself to the workload. Processes originating from any one node, if that node is too busy compared to others, can migrate to any other node. openMosix continuously attempts to optimize the resource allocation.

We achieve this with a kernel patch for Linux, creating a reliable, fast and cost-efficient SSI clustering platform that is linearly scalable and adaptive. With openMosix' Auto Discovery, a new node can be added while the cluster is running and the cluster will automatically begin to use the new resources.

There is no need to program applications specifically for openMosix. Since all openMosix extensions are inside the kernel, every Linux application automatically and transparently benefits from the distributed computing concept of openMosix. The cluster behaves much as does a Symmetric Multi-Processor, but this solution scales to well over a thousand nodes which can themselves be SMPs.

The openMosix Community is very active, contributing add-on applications and sharing helpful information with all users.  The openMosix Add-Ons and Community page lists these shared applications.  And, it is all GPL'd.

Documentation 
Introduction to openMosix presented by Moshe Bar and Maya, Anu, Asmita, Snehal, Krushna (MAASK)
Linux Clusters State of the Art by Moshe Bar
HPC Computing Applied to Business Applications by Moshe Bar
White Paper - Security and openMosix by Ian Latter
openMosix Internals - Hacker's Guide by Vincent Hanquez