Eucalyptus was designed to be easy to install and as non-intrusive as
possible. The software framework is modular, with industry-standard,
language-agnostic communication. Eucalyptus provides a virtual
network overlay that both isolates network traffic of different
users and allows two or more clusters to appear to belong to the
same Local Area Network (LAN). Also, Eucalyptus offers API
compatability with Amazon’s EC2, S3, and IAM services. This offers
you the capability of a hybrid cloud.