Ansible is a radically simple configuration-management, deployment, task-execution, and multinode orchestration framework.
Read the documentation and more at http://ansible.com/
Many users run straight from the development branch (it's generally fine to do so), but you might also wish to consume a release. You can find instructions here for a variety of platforms. If you want a tarball of the last release, go to releases.ansible.com and you can also install with pip.