Official Site:
https://www.openstack.org
OpenStack on Ubuntu:
https://ubuntu.com/openstack
OpenStack on Opensource:
https://opensource.com/resources/what-is-openstack
OpenStack Github:
https://github.com/openstack
OpenStack in Launchpad:
https://launchpad.net/openstack
Rackspace:
https://www.rackspace.com/openstack
OpenStack Twitter:
https://twitter.com/openstack