Portable-VirtualBox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. Developed by Runar Buvik
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.