Eucalyptus
An open source cloud computing and Infrastructure-as-a-Service (IaaS) platform for enabling private clouds. Eucalyptus takes a company’s existing IT infrastructure and adds a virtualization software layer with scalable, secure Web services that work together to create elastic pools with the ability to dynamically scale depending on the company’s needs.
Eucalyptus also offers an Infrastructure-as-a-Service product in partnership with Amazon that delivers full compatibility with Amazon’s Web Services APIs, enabling support for Amazon’s AWS EC2, S3, EBS, AMI and IAM services. This makes it possible to efficiently extend a Eucalyptus private cloud to a hybrid cloud environment.


