Parallels Virtuozzo alternatives

Parallels Virtuozzo
Parallels Virtuozzo Containers is an operating system virtualization solution that maximizes your investment in server hardware. Parallels Virtuozzo Containers is uniquely suited to Cloud server virtualization, enabling near instant provisioning and on-the-fly modification of hosting and Cloud server plans while delivering maximum density, cost efficiency and application performance.
Parallels Virtuozzo alternatives are:
VMware vSphere, Citrix XenServer, OpenVZ, KVM, Proxmox, Docker