Cfengine is an autonomous agent (a software robot).

Written by Mark Burgess, a Professor of Network and System Administration
at Oslo University College, Norway.

It is used to implement policy-based configuration management on open systems
(Unix-like environments) through the interpretation of its own declarative
language. It emphasizes an 'immunological' viewpoint, making its modus
operandi convergence to a stable state.

Note: Even though an rc file is included, at least an update.conf is needed
as well. A sample for which is included. For usage intros see:

Cluster Management with GNU cfengine by Mark Burgess
http://www.ieeetcsc.org/newsletters/2002-01/burgess.html

Automating Security with GNU cfengine by Kirk Bauer
http://www.linuxjournal.com/article/6848