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
Portable Virtualbox is a user-friendly and portable virtualization tool suitable for personal use and small-scale applications, whereas Xen is a powerful hypervisor designed for high-performance and scalable server virtualization, making it more suitable for enterprise environments.