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
VirtualBox is ideal for desktop virtualization and testing due to its user-friendly interface and support for various host operating systems. In contrast, Xen is designed for high-performance server virtualization, making it more suitable for enterprise environments with advanced resource management and security features.