- OpenVZ: Free software. OS-level virtualization Linux containers. Most popular among VPS providers. Many abuse it and oversell the available resources. Cheapest option.
- KVM: Free software. Full virtualization (allows custom kernels). Same level as Xen.
- Xen: Free software. Many versions available. Full virtualization. Same level as KVM.
- VMware: Proprietary software. Popular in corporate environments, less used by VPS providers.
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