[http://pve.proxmox.com Proxmox VE] is an easy to use Open Source virtualization platform for running pre-built Virtual Appliances and Virtual Machines (based on OpenVZ and also [http://www.linux-kvm.qumranet.com/kvmwiki org KVM] for full virtualization).

[http://proxmox.com The Proxmox] is [http://www.proxmox.com/cms_proxmox/en/virtualization/openvz/ using OpenVZ] for their spam filtering appliance can run as an OpenVZ container. (see [[Proxmox Mail Gateway in container]]). Proxmox is also the author of [http://www.proxmox.com/cms_proxmox/en/virtualization/openvz/vzdump/ vzdump[Vzdump]] utility.