This repo contains a subset of ansible-modules with slightly lower use or priority than "core" modules.
All new modules should be submitted here, and have a chance to be promoted to core over time.
Take care to submit tickets to the appropriate repo where modules are contained. The repo is mentioned at the bottom of module documentation page at docs.ansible.com.
Ansible module development guide contains the latest info about that.
As with Ansible, modules distributed with Ansible are GPLv3 licensed. User generated modules not part of this project can be of any license.
There should be no need to install this repo separately as it should be included in any Ansible install using the official documented methods.