What Cluster Management Software is Out There?

Dreddlox writes "I'm looking at a company producing cluster management software for Linux-based clusters such as Beowulf and would like to get a feel for waht's out there right now. I know Turbolinux for example has a product, enFuzion as do a few others. I'm trying to get a complete list of the players in this market as well as on any open source software and distributions of it if any exist. Also if anybody has any pointers or information on the use of Linux clusters in non-military and non-academic applications (such as auto manufacture and finance) especially outisde the US. I'm curious as to potential for such software in Europe and Asia (with all the talk of China being a ripe market for Linux due to the open source angle)."