Xen Project is a hypervisor using a microkernel design, providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently. Developed by Citrix
License: Open Source
Citrix XenServer is a commercial virtualization platform offering robust features and centralized management, making it suitable for enterprise environments. In contrast, Xen is an open-source hypervisor that provides flexibility and community support, ideal for users who need a customizable, lightweight solution.