Cfengine

From the site:

Cfengine, or the configuration engine is an autonomous agent and a middle to high level policy language and agent for building expert systems to administrate and configure large computer networks. Cfengine is designed to be a part of a computer immune system[1]. It is ideal for cluster management and has been adopted for use all over the world in small and huge organizations alike.

Usefull links
http://www.cfengine.org/	CFengine homepage
http://sial.org/howto/cfengine/	A cfengine howto