OpenStack is an open-source platform used as cloud computing infrastructure developed by Rackspace Cloud and NASA.
Today, AMD, Intel, Canonical, SUSE, Red Hat, Cisco, Dell, HP, IBM and Yahoo! More than 150 companies are involved. OpenStack is an open source and free software under Apache License. The system consists of three sub-parts: compute, storage and image services. With these features, it offers an open platform for companies that want to create private cloud computing clusters.