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Mitaka is the previous OpenStack release, not a distro. The most current release is Newton; the next one, in April, will be Ocata. Mirantis is a company that makes a distro, among other things. The big Linux vendors, at least Red Hat and SUSE, have their own distros as well.

You can install OpenStack from scratch. It's a good learning experience, which I recommend, but won't result in a production-ready system. The distros add things like a relatively easy to use installer, security features, high availability etc.