1 - OpenVZ

    OpenVZ is an Operating System-level server virtualization solution, built on Linux. OpenVZ creates isolated, secure virtual environments \u2014 VEs (otherwise known as virtual private servers, or VPSs) on a single physical server enabling better server utilization and ensuring that applications do not conflict. Each VE performs and executes exactly like a stand-alone server; VEs can be rebooted independently and have root access, users, IP addresses, memory, processes, files, applications, system libraries and configuration files. See OpenVZ Wiki for more information. (From the Openvz.org homepage)




Drawbacks

    Requires the VZs have the same kernel as the clients


Features

    Does not require hardware to use.
    Less Over head



Web Page http://openvz.org/


Wikipedia entry http://en.wikipedia.org/wiki/OpenVZ