Eucalyptus is an open source distribution to deploy your own Cloud Computing environment on whatever servers you might have lying around your basement… 
Or if you are an enterprise, you can deploy your own internal cloud computing environment.
Eucalyptus was developed at UC Santa Barbara as part of their high performance computing work.
Eucalyptus currently supports the Amazon AWS APIs and Sun is working with them to add the Sun APIs. Eucalyptus is/will be available in Ubuntu Jaunty/Jackalope release.
Enomaly sells service and extensions for enterprise customers for cloud computing and uses Eucalyptus as it’s base.
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