cluster

The ZeroC guys have constantly amazed me with the quality of their products.

Great grid & clustering software :)

Ceph is an open source distributed file system capable of managing many petabytes of storage with ease.
One remarkable feature is automatic distribution of data onto new nodes in the cluster.

Interesting distributed filesystem, conceptually similar to GlusterFS.

Free speed-reading webapp Spreed:News lets you choose from a wide array of news sources and have their articles read to you in small clusters of words. Working from the principals that make for faster reading, you can scale the tool between 240 and 150...

This tutorial shows how to configure a MySQL 5.1 cluster with five nodes: 1 x management, 2 x storage nodes and 2 x balancer nodes. This cluster is load-balanced by an Ultra Monkey package which provides heartbeat (for checking if the other node is still alive) and ldirectord (to split up the requests to the nodes of the MySQL cluster).

This tutorial shows how to set up a two-node Apache web server cluster that provides high-availability. In front of the Apache cluster we create a load balancer that splits up incoming requests between the two Apache nodes. Because we do not want the load balancer to become another "Single Point Of Failure", we must provide high-availability for the load balancer, too. Therefore our load balancer will in fact consist out of two load balancer nodes that monitor each other using heartbeat, and if one load balancer fails, the other takes over silently.

Pdsh is a high-performance, parallel remote shell utility.

Quoted: Enomalism Virtualized Management Dashboard (VMD) is a powerful web-based system management tool for the XEN hypervisor

Cluster computing in EC2