Top Alternatives to Xen

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. As an open-source, freely available software, it allows users to run multiple operating systems simultaneously on a single physical machine. This enables diverse use cases, from software development and testing to creating isolated environments for everyday tasks.

VMware vSphere Hypervisor, also known as ESXi, is a free, bare-metal hypervisor that allows users to virtualize their server hardware, consolidating applications and improving resource utilization. It provides a robust foundation for building virtualized IT environments.

KVM (Kernel-based Virtual Machine) is a powerful, integrated virtualization solution for Linux, turning the kernel into a hypervisor. It enables running multiple virtual machines with unmodified Linux or Windows guest operating systems, leveraging standard Linux scheduling and memory management.

OpenStack is an open-source cloud computing platform offering Infrastructure-as-a-Service (IaaS). It provides a flexible and scalable framework for building private and public clouds, managing vast pools of compute, storage, and networking resources.

Microsoft Hyper-V Server is a dedicated, lean hypervisor-based virtualization platform for creating and managing virtual machines. It provides core virtualization capabilities including live migration and clustering, offering a robust foundation for datacenter and cloud environments.

Portable-VirtualBox allows you to run virtual machines directly from a USB drive without requiring an installation on the host computer. It provides a convenient and portable way to access different operating systems and applications.

clearVM is a comprehensive, private cloud management solution designed for effortless administration of virtual machines and servers. It simplifies complex virtualization tasks, offering robust remote management capabilities via a intuitive web interface.

Citrix XenServer is a powerful, open-source virtualization platform designed for managing virtualized server infrastructures. It provides robust features for creating, deploying, and managing virtual machines and containers, making it a popular choice for data centers and cloud environments. XenServer offers high availability, live migration capabilities, and integration with various storage and networking solutions.

Bochs is a highly portable, open-source IA-32 and x86-64 IBM PC emulator and debugger. Primarily written in C++, it allows users to run various operating systems and software designed for x86 architectures on different platforms, offering a low-level emulation of hardware components.