Chef is a systems integration framework built to bring the benefits of configuration management to your entire infrastructure.

Puppet lets you centrally manage every important aspect of your system using a cross-platform DSL that manages all the separate elements normally aggregated in different files.

Automated deployment tasks similar to what Capistrano does.

RubyWorks production stack is a collection of open-source software required to host a RubyOnRails application on a Linux server.

Keep application configuration DRY by centralizing options in a YAML file.