EUCALYPTUS - Elastic Utility Computing Architecture for Linking Your Programs To Useful Systems - is an open-source software infrastructure for implementing “cloud computing” on clusters. The current interface to EUCALYPTUS is compatible with Amazon’s EC2 interface, but the infrastructure is designed to support multiple client-side interfaces.

May 14th, 2008: EUCALYPTUS is publically demonstrated at the Open Source Grid and Cluster conference.

May 29th, 2008: Version 1.0 is released as a feature-limited binary-only beta.

http://eucalyptus.cs.ucsb.edu/