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Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
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Docker Hub is a cloud-based registry service.
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The on-premises version of GitHub, which you can deploy and manage in your own, secure environment.
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Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.