Microsoft Hyper-V Server is described as 'free product that delivers enterprise-class virtualization for your datacenter and hybrid cloud' and is an app in the Network & Admin category. There are more than 25 alternatives to Microsoft Hyper-V Server for a variety of platforms, including Linux, Windows, Online / Web-based, BSD and Mac. The best alternative is VirtualBox, which is both free and Open Source. Other great apps like Microsoft Hyper-V Server are VMware Workstation Pro (Paid), virt-manager (Free, Open Source), Proxmox Virtual Environment (Freemium, Open Source) and Kubernetes (Free, Open Source).
Xen.org, home of the Xen hypervisor, the powerful open source industry standard for virtualization. It is a native (bare-metal) hypervisor providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently.
Portable-VirtualBox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. It unpacks and adjusts the paths and configuration of VirtualBox so it will run portably.
XCP-ng is a high-performance, enterprise-level hypervisor with a rich ecosystem and is the result of massive cooperation between individuals and companies. All commercial features are enabled with no commitment required to a support agreement.