What are some alternatives?
When comparing Xen Orchestra and WebVirtMgr, 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.
Virtualizor - Virtualizor is a powerful web based VPS Control Panel.
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.
SolusVM - Solus Virtual Manager (SolusVM) is a powerful GUI based VPS management system with full OpenVZ...
oVirt - oVirt is a virtualization management application.
Archipel - Archipel is a solution to manage and supervise virtual machines.