Ansible Galaxy
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`Ansible Galaxy <http://galaxy.ansible.com>`_, is a free site for finding, downloading, rating, and reviewing all kinds of community developed Ansible roles and can be a great way to get a jumpstart on your automation projects.
You can sign up with social auth, and the download client 'ansible-galaxy' is included in Ansible 1.4.2 and later.
Read the "About" page on the Galaxy site for more information.