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OpenStack is a project originally started by NASA and Rackspace for delivering a cloud computing and storage platform. Today, OpenStack is a global collaboration of developers and technologists producing an open source cloud computing platform for public and private clouds.

The technology consists of a series of interrelated projects delivering various components for a cloud infrastructure solution. OpenStack software delivers a massively scalable cloud operating system consisting of three major components:

OpenStack has attracted more than 500 member organizations, including Dell, Cisco, Citrix, HP, EMC, VMware, Red Hat, IBM and Intel, and the project is currently managed by the non-profit OpenStack Foundation.

Since its development in 2010, OpenStack has been updated on a roughly every-six-months release cycle. The OpenStack releases since 2010 have been:

See also "A Cloud Computing Dictionary Resource" in Webopedia's Quick Reference section.

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