Best virtualization software for xen or kvm?

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I'm looking to set up VMs on my dedicated server to help me limit the resource usage of some applications. Ovz isn't really an option given that it doesn't enforce resource management very strictly. So.. what is the best software to get kvm/xen virtualization working (preferably behind a NAT)

LowEndTalk http://ift.tt/1ib7rMu Best virtualization software for xen or kvm? Web vps hosting server Linux - Windows webvps.blogspot.com