Eucalyptus

The Eucalyptus Cloud platform is open source software for building AWS-compatible private and hybrid clouds. It pools together existing virtualized infrastructure to create cloud resources for compute, network and storage. The Eucalyptus Cloud can dynamically scale up or down depending on application workloads and is uniquely suited for enterprise clouds, delivering production-ready software that supports the industry-standard AWS APIs, including EC2, S3, EBS, and IAM. The benefits are highly efficient scalability, organization agility, and increased trust and control for IT.

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http://www.eucalyptus.com/