Citrix Hypervisor is described as '(formerly XenServer)
Citrix Hypervisor is a leading virtualization management platform optimized for application, desktop and server virtualization infrastructures' and is a Virtualization tool in the network & admin category. There are more than 25 alternatives to Citrix Hypervisor for a variety of platforms, including Linux, Self-Hosted, Windows, Mac and Web-based apps. The best Citrix Hypervisor alternative is VirtualBox, which is both free and Open Source. Other great apps like Citrix Hypervisor are Proxmox Virtual Environment, KVM (Kernel-based Virtual Machine), UTM and Unraid.