There is a big fight going on about who will provide the ‘operating system of the cloud’. Participants are a number of large names offering their own closed solutions, like Microsoft, VMware and Amazon. There seems to be a huge demand for an open source cloud platform and a number of projects are trying to fill this gap. According to recent research of the size en involvement of their respective communities, OpenStack is now clearly in the lead.
The Mirantis Blog
Your guide through the wilderness of Open Cloud