Open Source Cloud Software

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http://www.unix.com – Hi all, I'm prepared exploring cloud technology to play on both private and public clouds. Please advise which of the following Open Source Cloud software, other than Ubuntu One, will be more powerful on features:- Abiquo http://www.abiquo.com/ Amazon Elastic Compute Cloud (Amazon EC2) What is Amazon Elastic Compute Cloud (Amazon EC2)? - Definition from WhatIs.com Eucalyptus Cloud Computing Software from Eucalyptus | Leader in Cloud Software Or any other Open Source Cloud Software to suggest? I have been looking around on Abiquo website and couldn't find where to downlo (HowTos)