OpenNebula (One) is an Apache-licensed IaaS solution, which offer an image/template repository and a storage backend supporting NFS, GlusterFS, iSCSI, and LVM. OpenNebula is managed by a single organization that focuses on the interest of the project and strategically leads it to ensure that it meets the needs of the users and the community than other Cloud Management Platforms like Openstack and Cloudstack. Hence we can say that OpenNebula is more open than the rest of the Cloud Management Platforms and at the same time can provide an enterprise-ready open-source cloud solution.
OpenNebula do not deliver enterprise editions of their software, they commercially support thecommunity software. In other words, the community versions of OpenNebula are not limited editions of enterprise versions.