Adding opennebula

README.md

@@ -396,6 +396,7 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
 * [Ganeti](https://code.google.com/p/ganeti/) - Cluster virtual server management software tool built on top of KVM and Xen.
 * [KVM](http://www.linux-kvm.org) - Linux kernel virtualization infrastructure.
 * [oVirt](http://www.ovirt.org/) - Manages virtual machines, storage and virtual networks.
+* [OpenNebula](http://opennebula.org/) - Flexible enterprise cloud made simple
 * [Packer](http://www.packer.io/) - A tool for creating identical machine images for multiple platforms from a single source configuration.
 * [Vagrant](https://www.vagrantup.com/) - Tool for building complete development environments.
 * [VirtualBox](https://www.virtualbox.org/) - Virtualization product from Oracle Corporation.