Centralised configuration management for networks
Puppet lets you centrally manage every important aspect of your system
using a cross-platform specification language that manages all the
separate elements normally aggregated in different files, like users,
cron jobs, and hosts, along with obviously discrete elements like
packages, services, and files.
Puppet's simple declarative specification language provides powerful
classing abilities for drawing out the similarities between hosts while
allowing them to be as specific as necessary, and it handles dependency
and prerequisite relationships between objects clearly and explicitly.