virtualization

A very nice discussion on the comparison and preference of OpenVZ over Xen. Also, great SysAdmin articles at the FAQs and TIPs section: hosting & sysadmin

Kernel-based Virtual Machine (KVM) is a Linux kernel virtualization infrastructure. KVM is a full virtualization solution for Linux on x86 hardware containing virtualization extensions Intel VT (vmx) or AMD-V (svm). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. KVM also requires a modified QEMU although work is underway to get the required changes upstream.

VMware Server is a free virtualization product for Windows and Linux servers. VMware Server is a robust yet easy to use server virtualization product and is based on proven virtualization technology. Learn how to install configure and use VMware server in openSUSE

VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL).