What are some alternatives?
When comparing Xen Orchestra and Proxmox Virtual Environment, you can also consider the following products
VMmanager - VMmanager is a virtualization management software, which presents a perfect tool for creating virtual machines, providing VPS services and building cloud infrastructure.
oVirt - oVirt is a virtualization management application.
Virtualizor - Virtualizor is a powerful web based VPS Control Panel.
Archipel - Archipel is a solution to manage and supervise virtual machines.
OpenStack - OpenStack software controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API.
SolusVM - Solus Virtual Manager (SolusVM) is a powerful GUI based VPS management system with full OpenVZ...