The best Virtualization alternative to Unraid is TrueNAS, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Unraid and six of them are Virtualization Tools so hopefully you can find a suitable replacement. Other interesting Virtualization Tool alternatives to Unraid are Harvester, Microsoft Hyper-V Server, Citrix Hypervisor and Collax V-Bien.
TrueNAS (formerly FreeNAS) is an operating system that can be installed on virtually any hardware platform to share data over a network. TrueNAS is the simplest way to create a centralized and easily accessible place for your data.
Does not have built in functionality of virtual machines and "Docker" apps.
Harvester is the next generation of open-source hyperconverged infrastructure solutions designed for modern cloud-native environments.
Microsoft Hyper-V Server is a free product that delivers enterprise-class virtualization for your datacenter and hybrid cloud.
(formerly XenServer) Citrix Hypervisor is a leading virtualization management platform optimized for application, desktop and server virtualization infrastructures.
The Collax V-Bien is a complete package for virtualization and high availability. In addition to software and hardware, it also includes the patented Collax Fencing Device and support. Virtual networking, easy administration, data integrity.
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Since the previous comment, FreeNAS, now called TrueNAS has added support for VMs and Docker apps (though to setup a Docker environment, you must do so manually.) It has support for a plethora of things that competitors such as unraid does, such as plugins (for instance Plex, Nextcloud, Jenkins, and many others), ZFS, NAS, SMB, iSCSI, etc., and a very nice web GUI.