European OpenNebula pre-dates OpenStack and is written in a different programming language. Related links: https://opennebula.org/open-source-grid-cluster-con

European OpenNebula pre-dates OpenStack and is written in a different programming language. Related links: https://opennebula.org/open-source-grid-cluster-conference/ https://opennebula.org/open-source-grid-cluster-conference/ http://ercim-news.ercim.eu/en83/special/opennebula-leading-innovation-in-cloud-computing-management http://ercim-news.ercim.eu/en83/special/opennebula-leading-i... And consider the 2010 paper on "A Comparison and Critique of Eucalyptus, OpenNebula and Nimbus"