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 [http://www.iu.hio.no/~mark/research/immune computer immune system]. It is ideal for cluster management and has been adopted for use all over the world in small and huge organizations

alike.