Xen Hypervisor is described as 'The Xen Project hypervisor is an open-source type-1 or baremetal hypervisor, which makes it possible to run many instances of an operating system or indeed different operating systems in parallel on a single machine (or host)' and is a Virtualization tool in the network & admin category. There are four alternatives to Xen Hypervisor for a variety of platforms, including Linux, Windows, Mac, Android and Android Tablet apps. The best Xen Hypervisor alternative is VirtualBox, which is both free and Open Source. Other great apps like Xen Hypervisor are Proxmox Virtual Environment, VMmanager and Citrix Hypervisor.