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OpenStack has the support of many tech mainstays, including HP, IBM and Dell, all following its commitment to open-source development and the use of nonproprietary technologies in cloud stacks.
Rackspace turned control of the project over to the OpenStack Foundation in April. But, Amazon Elastic Compute Cloud, not a foundation member, remains the largest cloud services provider. In addition, Citrix in April ended support for OpenStack and moved its own cloud platform, CloudStack, over to the Apache Software Foundation.
Eucalyptus, a private cloud stack provider with API compatibility with Amazon, in March partnered with Amazon to help its customers transfer workloads between private clouds and Amazon Web Services.
VMware leadership position in virtualization is well known, but the company's is also the preferred private cloud infrastructure-as-a-service (IaaS) provider for businesses by a significant percentage, according to a recent survey of 100 executives interviewed.