What are some alternatives?
When comparing OpenNebula and oVirt, you can also consider the following products
Proxmox Virtual Environment - Proxmox VE is an open-source server virtualization platform to manage KVM virtual machines, LXC, software-defined storage and networking, HA clustering, and multiple other out-of-the-box tools on a single solution.
VMmanager - VMmanager is a QEMU/KVM server virtualization management software, which presents perfect tools for creating virtual machines, providing VPS services, and building cloud infrastructure.
OpenStack - OpenStack software controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API.
Virtualizor - Virtualizor is a powerful web based VPS Control Panel.
virt-manager - The virt-manager application is a desktop user interface for managing virtual machines through...
Scalr - Scalr is cloud management software for public & private infrastructure