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
Xen is a hypervisor that focuses on high-performance virtualization with strong isolation and security features, making it suitable for enterprise environments. In contrast, OpenStack is a cloud management platform that excels in scalability and user-friendliness, making it ideal for building and managing public and private clouds.