Server virtualization software from SWsoft, Renton, WA (www.swsoft.com) that partitions a Windows or Linux server into multiple execution environments (virtual environments). Using the OS virtualization method, Virtuozzo is noted for its performance and virtualization density (hundreds of virtual environments can run simultaneously). See OS virtualization.

OpenVZ
OpenVZ is a free, open source version of Virtuozzo for Linux only. SWsoft supports OpenVZ and encourages developers to further develop OS virtualization techniques. Over time, Virtuozzo may include enhancements to OpenVZ. For more information, visit www.openvz.org.