Cfengine – Tool for configuring and maintaining network machines

Cfengine is an automated suite of programs for configuring and maintaining Unix-like computers. It has been used on computing arrays of between 1 and 20,000 computers since 1993 by a wide range of organizations. Cfengine is supported by active research and was the first autonomic, hands-free management system for Unix-like operating systems.
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Puppet – 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.
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